SOLUTION: One pump can drain a pool in 7 minutes. When a second pump is also used together with the first, the pool only takes 2 minutes to drain. How long would it take the second pump to d

Question 378756: One pump can drain a pool in 7 minutes. When a second pump is also used together with the first, the pool only takes 2 minutes to drain. How long would it take the second pump to drain the pool if it were the only pump in use?
Found 2 solutions by user_dude2008, scott8148:
Answer by user_dude2008(1862) (Show Source): You can put this solution on YOUR website!
1/7+1/t=1/2

2t+14=7t

14=7t-2t

14=5t

t=14/5 <---- Answer
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
in the 2 min it takes to drain the pool , the 1st pump drains 2/7 of the pool

the 2nd pump drains 5/7 of the pool in 2 min ___ it could drain the whole pool in [2 / (5/7)] min

14/5 min or 2 min 48 sec
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