Pipes and Cisterns Practice Test 2 with solutions

Question : 37 of 40

Marks: +1, -0

Two pipes A and B can fill a tank in 7 and

9 1/3

hours respectively. If both the pipes are opened simultaneously, how much time will be taken by them to fill it?

Solution:

Part of tank filled by ‘A’ in 1 hour =

1/7

Part of tank filled by ‘B’ in 1 hour =

3/{28}

Part of tank filled by (A + B) in 1 hour =

1/7 + 3/{28}

{4+3}/{28}

7/{28}

1/4

So, time taken by both to fill the tank = 4 hours

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