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Question

A balloon has two holes. The first hole alone would have made the balloon flat in 9 mins and the second hole would have done it in 6 mins. If air leaks out at a constant rate, how long does it take for both the holes together to make the balloon flat?


A

3/2 mins

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B

7/2 mins

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C

18/5 mins

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D

17/4 mins

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E

None of these

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Solution

The correct option is C

18/5 mins


1 minute’s work for both the holes = (19 + 16) = 518

So, both the holes will make the balloon flat in 185 mins.


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