An empty tank whose capacity is 50 litres There is an inlet pipe which fills at 7 L min and there is...........

Quantitative Aptitude ( CCS) Pipes&cistern

An empty tank whose capacity is 50 litres. There is an inlet pipe which fills at 7 L/min and there is an outlet pipe which empties at 6L/min. Both the pipes function alternately for 1 minute. The inlet pipe is the first one to function, how much time will it take for the tank to be filled up to its capacity?

100

110

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Explanation:

Solution:
Capacity 50 litres
1st Minute 7l filled (through inlet pipe)
2nd minute 6l emptied(through outlet pipe)
In 2 minutes (7litres -6 litres =) 1l is filled
It takes 2 minutes to fill 1l then 84 minutes to fill 42 litres.
in 85th min – 42+7 = 49
in 86th – 49-6 = 43
in 87th – 43+7 = 50