SOLUTION: A school's new pump can fill a swimming pool in 5 hours the old pump takes 10 hours. How many hours will it take to fill the pool if both pumps are used?

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Question 839661: A school's new pump can fill a swimming pool in 5 hours the old pump takes 10 hours. How many hours will it take to fill the pool if both pumps are used?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1/5+1/10=1/x
2/10+1/10=1/x
3/10=1/x
x=10/3
x=3 1/3 hours together