Pipe A fills a tank in 56 minutes.

Pipe A fills a tank in 56 minutes. Pipe B can fill the same tank 7 times as fast as pipe A. If both the pipes are kept open when the tank is empty, how many minutes will it take to fill the tank?

Quiz

Answer/Solution

7

Steps/Work

A's rate is 1/56 and B's rate is 1/8.
The combined rate is 1/56 + 1/8 = 1/7
The pipes will fill the tank in 7 minutes.
The answer is D.

Physics Calculator / Auto Solver

Pipe a fills a tank in minutes. Pipe b can fill the same tank times as fast as pipe a. If both the pipes are kept open when the tank is empty, how many minutes will it take to fill the tank?

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