Solve.
-One pump can drain a pool in 9 minutes. When a second pump is also used, the pool only takes 6 minutes to drain. How long would it take the second pump to drain the pool if it were the only pump in use?
A) $3 \frac { 3 } { 5 } \mathrm {~min}$
B) $\frac { 1 } { 18 } \mathrm {~min}$
C) $51 \mathrm {~min}$
D) $18 \mathrm {~min}$

Question

Quizplus · Accepted Answer

The first pump drains the pool at a rate of 1/9 pools per minute. Together, they drain at a rate of 1/6 pools per minute. The second pump's rate is 1/6 - 1/9 = 1/18 pools per minute, so it would take 18 minutes to drain the pool alone.

Solve -One Pump Can Drain a Pool in 9 Minutes 335 min3 \frac { 3 } { 5 } \mathrm {~min}353​ min

Solve
-One Pump Can Drain a Pool in 9 Minutes $3 \frac { 3 } { 5 } \mathrm {~min}$