Pipe A fills a tank in 12 hours and pipe B in 6 hours. If both are opened together, how long do they take to fill the empty tank?
Answer and explanation
Correct answer: D. 4 hours
- Step 1: Rate of A + rate of B = 1/12 + 1/6 = 1/4 of the tank per hour.
- Step 2: Time = 4 hours.
Answer
4 hours.
Practise more Arithmetic: Time, Work and Speed.
Free questions with an explanation for every one, and full timed SSC CGL mock tests.
More Arithmetic: Time, Work and Speed questions
- A can complete a job in 12 days and B in 6 days. Working together, in how many days will they complete it?
- A train 180 m long runs at 54 km/h. How many seconds does it take to cross a pole?
- A person covers 120 km at 40 km/h and returns the same 120 km at 60 km/h. What is the average speed for the whole journey?
- A can complete a job in 15 days and B in 10 days. Working together, in how many days will they complete it?
- A can complete a job in 6 days and B in 12 days. Working together, in how many days will they complete it?
- A train 300 m long runs at 36 km/h. How many seconds does it take to cross a pole?