Solve.
-One pump can drain a pool in 12 minutes. When a second pump is also used, the pool only takes 4 minutes to drain. How long would it take the second pump to drain the pool if it were the only pump in use?
A) $6 \mathrm {~min}$
B) $40 \mathrm {~min}$
C) $\frac { 1 } { 6 } \min$
D) $3 \mathrm {~min}$

Question

Quizplus · Accepted Answer

Let the time taken by the second pump to drain the pool be x minutes. Then,1/12 + 1/x = 1/4⇒ 1/x = 1/4 - 1/12⇒ 1/x = 1/6⇒ x = 6 minutes

Solve -One Pump Can Drain a Pool in 12 Minutes 6 min6 \mathrm {~min}6 min

Solve
-One Pump Can Drain a Pool in 12 Minutes $6 \mathrm {~min}$