A pipe can fill a cistern in 8 hours After half the tank is filled three more similar taps are opene...........

Quant (SSC) Pipes&cistern

A pipe can fill a cistern in 8 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the cistern completely?

3 hours

2 hours

5 hours

4 hours

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Explanation:

In One hour pipe can fill = 1/8
Time is taken to fill half of the tank = 1/2 * 8 = 4 hours
Part filled by four pipes in one hour = (4*1/8) = 1/2
Required Remaining Part = 1/2
Total time = 4 + 1 = 5 hours