SOLUTION: Tap a is able to fill a bath in 20 minutes, tap b is able to fill the same bath in 30 minutes. How long would it take them to fill the same bath if they are turned on together

Question 888909: Tap a is able to fill a bath in 20 minutes, tap b is able to fill the same bath in 30 minutes. How long would it take them to fill the same bath if they are turned on together
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
Tap a is able to fill a bath in 20 minutes, tap b is able to fill the same bath in 30 minutes. How long would it take them to fill the same bath if they are turned on together
.
Let x = time (minutes) it takes for both
then
x(1/20 + 1/30) = 1
multiplying both sides by 60:
x(3 + 2) = 60
x(5) = 60
x = 12 minutes
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