Asked by patel

a tank can be filled by one pipe in 3.5 hours and emptied by another in 4.2 hours. if both pipes are running, how long will take to fill an empty tank ?
Answered by bobpursley
rate=amount/time

rate combined=sum of rates=1tank/3.5hr+1tank/4.2hrs

rate combined=(4.2+3.5)/(3.5*4.2) tanks/hr work this out.

time= 1tank/(above rate)
Answered by Steve
I also misread the problem. It is being </b>emptied</b> at 4.2 hrs.
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