Related Questions

In a certain country, a person is born in every 5 seconds and a person dies every 13 seconds. Therefore the birth and death and death rates account for a population growth rate of one person every-
A 0.123sec
B 9sec
C 8sec
D 8.125sec
What is the chemical name of the deadly poison 'cyanide'?
A Sulphuric acid
B Hydrochloric acid
C Nitric acid
D Prussic acid
Machine A produces bolts at a uniform rate of 120 every 40 seconds and Machine B produces bolts at a uniform rate of 100 every 20 seconds. If the two machines run simultaneously , how many seconds will it take for them to produce a total of 200 bolts.
A 22
B 25
C 28
D 32
Machine A produces bolts at a uniform rate of 120 every 40 seconds, and Machine B produces bolts at a uniform rate of 100 every 20 seconds. If the two machines run simultaneously, how many seconds will it take for them to produce total of 200 bolts?
A 22
B 25
C 28
D 32
Based on the information below, how much did a certain telephone call cost? 1. The call lasted 1 minute 27 seconds 2. The cost for the first 30 second unit is Tk. 1.80, call duration more than 30 seconds costs Tk. 0.90 per 30 second unit 3. Any call duration less than 30 seconds is rounded up to the nearest 30-second unit.
A Tk. 1.80
B Tk. 2.61
C Tk. 2.70
D Tk. 3.51
Two trains of the same length running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively andhey cross each other in 23 seconds. What is the ratio of their speeds?
A 1 : 2
B 1 : 3
C 3 : 2
D 5 : 8
A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they gain meet at the starting point altogether?
A 26 minutes and 18 seconds
B 42 minutes and 36 seconds
C 45 minutes and 38 seconds
D 46 minutes and 12 seconds
Two tarins running in opposite direction cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is :
A 1 : 3
B 3 : 2
C 3 : 4
D None of these
In a certain country a person is born every 7 seconds and a person dies every 13 seconds. Therefore, the birth and death rates account of a population growth rate of one person every-0
A 4.5 seconds
B 6 seconds
C 15.17 seconds
D 20 seconds
In a certain country. A person is born every 7 seconds and a person dies every 10 seconds. Therefore, the birth and death rates account for a population growth rate of one person every---
A 4.5seconds
B 6 seconds
C 15.17 seconds
D 20 seconds

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