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Taps ‘A’ and ‘B’ can fill a tank in 37 1/2minutes and 45 minutes respect ively. Both taps are opened and after some time tap ‘B’ is turned off. The tank is filled completely in exactly 30 minutes, - Mathematics

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MCQ

Choose the most appropriate option

Taps ‘A’ and ‘B’ can fill a tank in `37 1/2` minutes and 45 minutes respectively. Both taps are opened and after some time tap ‘B’ is turned off. The tank is filled completely in exactly 30 minutes, if tap ‘B’ is turned off after:

Options

  • 12 minutes

  • 15 minutes

  • 9 minutes

  • 10 minutes

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Solution

9 minutes

Explanation:

By shortcut method,

Pipe B should be closed after`=(1-(30xx2) /75) xx 45`

`=15/75xx45`

= 9 minutes.

Concept: Time, Distance and Speed(Entrance Exam)
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