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 open, how long will it take to fill the sink?
Answers
bobpursley
ratedraining= 1sinkluff/12min
ratefilling=1sinkfull/6min
time= 1 sink/(1/12+1/6)=12*6/(6+12)=4 min
ratefilling=1sinkfull/6min
time= 1 sink/(1/12+1/6)=12*6/(6+12)=4 min
seems to me like the sink is being filled at the rate of 1/6 - 1/12 = 1/12 sink/min, so it will take 12 minutes to fill it if the drain is open.
Related Questions
The first of three pipes fills a tank in 12 minutes and a second pipe in 10 minutes. If both these p...
1) Mio can build a large shed in 15 days less than Yuuko can. If they build it together, it would ta...
a water tank is filled by two pipes in 48 minutes. if the larger pipe fill it alone in 40 minutes le...