One pump can drain a pool in 10 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?

Question

anonymous · Answer

yeah see.....
1/10 + b = 1/9  per minute.

b = 1/90  per minute.

90 minutes to drain it complete...
Hope it helps!!

anonymous · Answer

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