Posted by patel on Friday, October 21, 2011 at 9:09am.
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)
I also misread the problem. It is being emptied at 4.2 hrs.
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