Asked by Anonymous

one pipe can fill a tank in 90 minutes a second pipe can fill the tank in 60 minutes how long will it take to fill the tank if both pipes are

Answers

Answered by Reiny
assuming your incomplete sentence is
"... how long will it take to fill the tank if both pipes are open "

rate of first = 1/90
rate of 2nd = 1/60
combined rate = 1/90+1/60 = 1/36

time at combined rate = 1/(1/36) = 36 minutes
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