An Inlet pipe can fill a tank in 5 hours and an Outlet pipe can empty 4 7 of the same Tank in 4 hour...........

Quantitative Aptitude ( CCS) Pipes&cistern

An Inlet pipe can fill a tank in 5 hours and an Outlet pipe can empty 4/7 of the same Tank in 4 hours. In the first hour only Inlet pipe is opened and in the second hour, only outlet pipe is opened. They have opened alternately every hour until the Tank is filled. Then in how many hours does the Tank gets filled?

17 Hours 17 Min

34 Hours 60/7 Min

35 Hours 15 Min

36 Hours 60/7 Min

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Explanation:

Answer & Explanation
Answer – B. 34 Hours 60/7 Min
Explanation :
2 hours work = 1/5-1/7 = 2/35
34 hours work = 34/35
remaining work = 1/35
Now its inlet pipe turn = 1/35*5 = 1/7
= 34 hours + 60/7 min