Posted by Jaison on Wednesday, March 23, 2011 at 8:54am.
Add the pumping rates in pools per day to get the combined pumping rate.
Rate = 1/5 + 1/7 = 12/35 pools per day
Time required = (1 pool)/(12/35 pool/day) = 35/12 day = 70 hours
That agrees with your answer. Don't round off 35/12 as 3 days. You will be marked wrong.
Thanks
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