Solve
-One Pump Can Drain a Pool in 12 Minutes $105 \mathrm {~min}$

Multiple Choice

Solve.
-One pump can drain a pool in 12 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) $105 \mathrm {~min}$
B) $5 \frac { 1 } { 7 } \mathrm {~min}$
C) $\frac { 1 } { 36 }$ min
D) $36 \mathrm {~min}$