Pipe A can fill a tank in 10 hours and Pipe B can empty it in 15 hours. How long will it take to fill the tank if both pipes are opened together?

Topic: Work and Time
Subtopic: Pipes and Cisterns

A20 hours

B25 hours

C30 hours

D35 hours

Explanation

Net filling rate = 1/10 – 1/15 = (3 – 2) / 30 = 1/30 per hour. Time to fill the tank = 30 hours.

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