54. Two pipes A and B can fill a tank in 15 hours and 20 hours respectively while a third pipe C can empty the full tank in 25 hours. All the three pipes are opened in the beginning. After 10 hours, C is closed. The time taken to fill the tank is
options r 35 hours, 12hours, 14hours, 18hours
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Explanation:
The time taken to fill the tank is 18 hours.
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