Two pipes, A and B, can fill a tank. Pipe A alone can fill the tank in 6 hours, and Pipe B alone can fill it in 9 hours. If both pipes are opened simultaneously, how long will it take to fill the tank?

Question

BrainForge Quiz · Accepted Answer

A) 3 hours 36 minutes. Pipe A fills 1/6 of the tank per hour, Pipe B fills 1/9. Together, they fill (1/6 + 1/9) = 5/18 of the tank per hour. The total time to fill the tank is 1 / (5/18) = 18/5 = 3.6 hours, which is 3 hours and 36 minutes.

Two pipes, A and B, can fill a tank. Pipe A alone can fill the tank in 6 hours, and Pipe B alone can fill it in 9 hours. If both pipes are opened simultaneously, how long will it take to fill the tank?

✓ Correct Answer: Option A

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