Posted by shirley on Friday, February 22, 2013 at 9:49am.
12/60 = 1/5 of an hour
1 tank can be filled in 1/5 of an hour
your rate is 5 tanks per hour
20/60 = 1/3 of an hour
The tank can be filled in 1/3 of an hour. your rate is 3 tanks per hour
(5 tanks per hour)time + (3 tanks per hour)time = 1 tank filled
5t + 3t = 1
t =1/8 of an hour.
This makes sense because it should take less time to fill the tank if both are working together.
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