Two pipes X and Y can fill a tank in 24 mins and 32 mins each. If both the pipes are started at the same time, after what time should Y be closed to fill up the tank in 18 mins?

10 mins

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15 mins

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5 mins

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8 mins

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Solution

The correct option is D
8 mins

If Y is closed after `a' mins, then a ( $\frac{1}{24} + \frac{1}{32}) + (18 - a) \times \frac{1}{24}$ = 1

Hence, Y should be closed after 8 mins.

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Two pipes X and Y can fill a tank in 24 mins and 32 mins each. If both the pipes are started at the same time, after what time should Y be closed to fill up the tank in 18 mins?

The correct option is D 8 mins If Y is closed after `a' mins, then a (124+132)+(18−a)×124 = 1 Hence, Y should be closed after 8 mins.

The correct option is D
8 mins

If Y is closed after `a' mins, then a ( $\frac{1}{24} + \frac{1}{32}) + (18 - a) \times \frac{1}{24}$ = 1

Hence, Y should be closed after 8 mins.