SOLUTION: if one outlet pipe can drain a tank in 24 hours while a second outlet pipe can drain the same tank in 36 hours, how long will it take to drain the tank if both pipes are open?

Question 321571: if one outlet pipe can drain a tank in 24 hours while a second outlet pipe can drain the same tank in 36 hours, how long will it take to drain the tank if both pipes are open?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
if one outlet pipe can drain a tank in 24 hours while a second outlet pipe can drain the same tank in 36 hours, how long will it take to drain the tank if both pipes are open?
draining the tank is 1 job.
..
1 drain does the job in 24 hours
so it does 1/24 of the job in 1 hour.
..
second does the job in 36 hours
so it does 1/36 of the job in 1 hour
..
together they do 1/24+1/36 of the job in 1 hour
LCD = 72
= 3+2/72
=5/72
5/72 0f the job they do together in 1 hour
1 job they do in 72/5 hours
=14.4 hours
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