SOLUTION: in one person can wash a car in 20 minutes and another person washes a car in 30 minutes,how long will it take together to wash a car
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Question 595491: in one person can wash a car in 20 minutes and another person washes a car in 30 minutes,how long will it take together to wash a car Answer by edjones(8007) (Show Source):
You can put this solution on YOUR website! One can do 1/20 of the job in 1 minute.
The other can do 1/30.
1/20 + 1/30
=3/60 + 2/60
=5/60
=1/12 the job together in 1 minute.
12 minutes it takes to do the job together.
.
Ed
