Bissoy.com
Doctors Medicines MCQs Q&A

An air conditioner can cool the hall in 40 miutes while another takes 45 minutes to cool under similar conditions. If both air conditioners are switched on at same instance then how long will it take to cool the room approximately ?

An air conditioner can cool the hall in 40 miutes while another takes 45 minutes to cool under similar conditions. If both air conditioners are switched on at same instance then how long will it take to cool the room approximately ? Correct Answer 22 minutes

Let the two conditioners be A and B

 

'A' cools at 40min

 

'B' at 45min

 

Together = (a x b)/(a + b)

= (45 x 40)/(45 + 40)

= 45 x 40/85

= 21.1764

= 22 min (approx).

Related Questions

There are five cinema halls in a building - Hall 1, Hall 2, Hall 3, Hall 4 and Hall 5. They are one above the other. Hall 1 is at the bottom, then Hall 2 above it and so on. Five movies A, B, C, D and E are displayed in these given halls. Only one movie is displayed in a particular cinema hall. Each movie is displayed only one time. Movie E is displayed at a even numbered hall. Movie B is displayed at Hall 1. Movie A is displayed at the hall just below E. Movie D is not displayed at even numbered hall. Which of the following statement is not correct about movie C? 
There are five cinema halls in a building near the airport – Hall1, Hall 2, Hall 3, Hall 4 and Hall 5. Hall 1 is at the bottom, Hall 2 above it and so on. Five movies – P, Q, R, S, and T are displayed in these given halls. Only one movie is displayed in a particular cinema hall. Each movie is displayed only once. Movie T is displayed at an even numbered hall. Movie Q is displayed at Hall 1. Movie P is displayed at the hall just below T. Movie S is not displayed at an even numbered hall. Which of the following statement is NOT correct about Movie R?
What is the root cause of Ozone destruction? (a) Use of air conditioners, refrigerators, sprays. (b) Use of air conditioners, refrigerators water filters. (c) Use of sprays, air conditioners. (d) Use of washing machines, water filters and air conditioners.
In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: Air conditioning is the process of removing heat and moisture from the interior of an occupied space to improve the comfort of occupants. Air conditioning can be used in both domestic and commercial environments.  B: Electric refrigerant-based AC units range from small units that can cool a small bedroom, which can be carried by a single adult, to massive units installed on the roof of office towers that can cool an entire building. C: Air conditioners often use a fan to distribute the conditioned air to an enclosed space such as a building or a car to improve thermal comfort and indoor air quality.  D: This process is most commonly used to achieve a more comfortable interior environment, typically for humans and other animals.
If a shopkeeper sold 50 air conditioners in a week, how much air conditioner he needs to sell each day for the remaining days such that the average air conditioner sold for 15 days is 6?
Directions : In each of the following questions a statement is given, followed by two conclusions. Give answer :

Statement : "X air-conditioner - the largest selling name with the largest range." - An advertisement.

Assumptions :
I. X air-conditioner is the only one with wide variations.
II. There is a demand of air-conditioners in the market.
Given below are three quantities named A, B and C. Based on the given information; you have to determine the relationship between the two quantities. You should use the given data and your knowledge of Mathematics to choose between the possible answers. The options represent the relations between these three quantities A) > B) < C) = D) ≤ E) ≥ Two pipes P and Q can fill an empty tank in 20 minutes and 30 minutes respectively. Quantity A: If both pipes are opened simultaneously, then after what certain time P should be closed so that further time after which the tank is filled in 15 minutes? Quantity B: If both are opened and P is closed after 8 minutes, how much further time would it take for Q to fill the bucket? Quantity C: Pipe A and B can fill a tank in 15 minutes and 10 minutes respectively. Pipe C can empty the tank in 5 minutes. Pipe A and B are opened simultaneously and after the 4-minute pipe, C is also opened. In what time the tank will be emptied?
In the question below is given a statement followed by two courses of action numbered I and II. You have to assume everything in the statement to be true and on the basis of the information given in the statement, decide which of the suggested course of action logically follow(s) for pursuing. Statement: Sana started using shampoo and conditioner of company X few months ago and developed the problem of hair fall. Courses of action: I. She should continue with the conditioner and try another shampoo. II. She should try another conditioner and continue with the shampoo.
The following question, there are three statements I, II and III. Read the question carefully and mark your answer according to which statements(s) is/are sufficient to the answer the question. Find the total cost of flooring a room? Statement I: The length of the room is 70% more than the breadth of the room Statement II: The cost of flooring some other room whose length is twice the length of the given room and breadth is one third of the breadth of the given room is Rs.3000 less than the cost of flooring of given room Statement III: The perimeter of the room is 90 m and cost of flooring is Rs. 20 per m2
Hotel Aditya has 10 single AC rooms, 5 double AC rooms and 18 non AC rooms. The fixed monthly rent of hotel is 150,000. The per day maintenance cost is Rs. 100 for double AC room, Rs. 75 for single AC room and Rs. 40 for non AC room. The per day charges are Rs. 600 for double AC room, Rs. 400 for single AC room and Rs. 250 for non AC room. In April 2003, the occupancy rate of non AC room was 50%, 70% of single AC room and 40% of double AC rooms. Find the profit/loss % for that particular month.