Solve.
-One pump can drain a pool in 11 minutes. When a second pump is also used, the pool only takes 9 minutes to drain. How long would it take the second pump to drain the pool if it were the only pump in use?
A)97 minutes
B) $49 \frac { 1 } { 2 }$ m minutes
C) $\frac { 2 } { 99 }$ m minutes
D) $4 \frac { 19 } { 20 }$ mi mnutes

Question

Quizplus · Accepted Answer

The first pump drains the pool at a rate of 1/11 pools per minute. Together, they drain at a rate of 1/9 pools per minute. The second pump's rate is the difference: 1/9 - 1/11 = 2/99 pools per minute. Thus, it would take the second pump 99/2 minutes, or $49 \frac { 1 } { 2 }$ minutes, to drain the pool alone.

Solve -One Pump Can Drain a Pool in 11 Minutes 491249 \frac { 1 } { 2 }4921​

Solve
-One Pump Can Drain a Pool in 11 Minutes $49 \frac { 1 } { 2 }$