An electric pump can fill a tank in 2 hours Because of a leak in the tank it took 2 hours 30 min to ...........

Quant (SSC) Pipes&cistern

An electric pump can fill a tank in 2 hours. Because of a leak in the tank, it took 2 hours 30 min to fill the tank. In what time the leak can drain out all the water of the tank and will make tank empty ?

12hrs

7hrs

10hrs

14hrs

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Explanation:

Work done for 1 hour without leak = 1/2
Work done with leak = 2(1/2)=5/2
Work done with leak in 1 hr= 2/5
Work done by leak in 1 hr =1/2−2/5
=5-4/10=1/10
Hence, option 3 is the correct answer.