Pipes and Cisterns Practice Test 2 with solutions

Question : 28 of 40

Marks: +1, -0

Pipe A takes 2 minutes more than Pipe B to fill a tank that can be filled by Pipe B in 10 minutes. Find the time taken to fill the empty tank if both the pipes A and B are opened simultaneously.

5 minutes
$5 5/{11}$ minutes
4 minutes
$4 1/2$ minutes
None of the above

Validate

Solution:

Time taken by Pipe B = 10 minutes
Time taken by Pipe A = 12 minutes
Work done by both in 1 minute =

1/{10}+1/{12}

{6+5}/{60}

{11}/{60}

So, time taken by both =

{60}/{11}

5 5/{11}

minutes

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