Solve.
-Two pipes can be used to fill a pool. Working together, the two pipes can fill the pool in 7 hours. The larger pipe can fill the pool in 3 hours less time than the smaller pipe can alone. Find the time to the nearest tenth of an
Hour it takes for the smaller pipe working alone to fill the pool.
A) 15.7 hours
B) 15.8 hours
C) 12.8 hours
D) 12.7 hours

Question

Quizplus · Accepted Answer

Let x be the time it takes for the smaller pipe to fill the pool alone. Then the larger pipe takes (x - 3) hours. The combined rate is 1/7 pools per hour. The equation is 1/x + 1/(x-3) = 1/7. Solving gives x ≈ 15.7 hours.

Solve. -Two Pipes Can Be Used to Fill a Pool. Working