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Original Question
A sink can be filled by a pipe in 6 minutes but it takes 12 minutes to drain a full sink. If both the pipe and the drain are op...Asked by Casandra
A sink can be filled by a pipe in 2 minutes but it takes 4 minutes to drain a full sink. if both the pipe and the drain are open, how long will it take to fill the sink?
Answers
Answered by
Steve
1/2 - 1/4 = 1/x
x = 4
Check:
water comes in at 1/2 sink/minute
water drains out at 1/4 sink/minute
net flow: 1/2-1/4 = 1/4 sink/min
So, it takes 4 minutes to fill the sink
x = 4
Check:
water comes in at 1/2 sink/minute
water drains out at 1/4 sink/minute
net flow: 1/2-1/4 = 1/4 sink/min
So, it takes 4 minutes to fill the sink
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