SOLUTION: A large pipe can fill a tank in 10 minutes, and a smaller pipe can fill the tank in 20 minutes. How long will it take to fill the tank if the both pipes are used at the same time?

Question 411440: A large pipe can fill a tank in 10 minutes, and a smaller pipe can fill the tank in 20 minutes. How long will it take to fill the tank if the both pipes are used at the same time?
Thank you,
--Nienyotza
Answer by sudhanshu_kmr(1152) (Show Source): You can put this solution on YOUR website!
if both pipes are used then in one minute tank will fill ( 1/10 - 1/20 ) portion
it is 1/20 portion...

as 1/20 portion of tank fill in 1 minute.

so, for 1 complete portion 1 / (1/20) = 20

so, 20 minutes.....

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