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Four friends A, B, C and D need to cross a bridge. A maximum two persons can cross it at a time. It is night and they just have one lamp. Persons that cross the bridge must carry the lamp to find the way. A pair must walk together at the speed of slower person. After crossing the bridge, the person having faster speed in the pair will return with the lamp each time to accompany another person in the group. Finally, the lamp has to be returned at the original place and the person who returns the lamp has to cross the bridge again without lamp. To cross the bridge, the time taken by them is as follows: A :1 minute, B : 2 minutes, C : 7 minutes and D : 10 minutes. What is the total minimum time required by all the friends to cross the bridge?
The following questions are accompanied by three statements (I), (II), and (III). You have to determine which statements(s) is/are sufficient/necessary to answer the questions. Pipe A and B can fill a tank at the rate of 12 and 10 litre per minute respectively. What is the capacity of the tank? I. Pipe C can empty tank in 5 hours. II. If A and B are opened simultaneously, the tank is filled in 5 hours 45 minutes and a leakage hole drains the pipe at the rate of 6 litres/minute.  III. If A and B are opened simultaneously, the tank is filled in 5 hours 45 minutes and due to a leakage, the filled tank drains in 15 hours 20 minutes.
The first and the last parts of the sentence/paragraph are numbered 1 and 6. The rest of the sentences are split into four parts and A, B, C and D. These four parts are not given in their order. Read the sentence/paragraph and find out which of the four combinations is correct. Without a sewerage system, the effluent from the septic tank, has to be periodically emptied from the septic tank, along with greywater from the kitchen and The faecal sludge, on the other hand, bathroom flows out into stormwater drains and open drains or nullahs.        6. either manually or mechanically using vacuum trucks or tankers.
Catch water drains, sloping drain, road side drains, catch pit and culverts are periodically cleared to prevent __________
A water tank has been fitted with two taps P and Q and a drain pipe R. Taps P and Q fill at the rate of 12 litres per minute and 10 litres per minute respectively. Consider the following statements S1, S2 and S3: S1: Pipe R drains out at the rate of 6 litres per minute S2: If both the taps and the drain pipe are opened simultaneously, then the tank is filled in 5 hours 45 minutes S3: Pipe R drains out (fully) the filled tank in 15 hours 20 minutes. To know what is the capacity of the tank, which one the following is correct?
Four friends A, B, C and D need to cross a bridge in the night. A maximum of 2 people can cross at a time. They have only one lamp. A takes one minute to cross the bridge. B takes 2 minutes, C takes 8 minutes and D takes 11 minutes to cross the bridge respectively. A pair must walk together at the speed of the person who walks slowly. What is the minimum time required to cross the bridge by all four people? 
In the bottom of a water tank, there are two drains A and B. If only A is open, it takes 30 minutes to empty a full tank and if only B is open, it takes 20 minutes. If for 10 minutes both drains are open, then B is closed, how much time it takes to empty a full tank?
Which of the following are some distinctive features of Mohanjodaro? 1. It was a planned Urban city in which the lower town was also walled. 2. Grid pattern drainage system intersecting at right angles. 3. Every house had its own bathroom paved with bricks, with drains connected through the wall to the street drains. 4. Houses were a build-up to the ground floor as no remains of the staircase have been found.
Which statement is true for underground drainage in highways? 1. Ground water surface should be at least 1.5 m below sub grade 2. Transverse drains are also used in low permeability soils 3. Transverse drains are used in all types of soils Select the correct answer from the codes given below
Shallow surface drains are connected to outlet drains.