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प्रश्न
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:
विकल्प
12 minutes
15 minutes
9 minutes
10 minutes
उत्तर
9 minutes
Explanation:
By shortcut method,
Pipe B should be closed after`=(1-(30xx2) /75) xx 45`
`=15/75xx45`
= 9 minutes.
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