SOLUTION: pump A can do a job in 42 mins and pump B can do a job in 35 mins. how long if both pumps are used.
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Question 283680: pump A can do a job in 42 mins and pump B can do a job in 35 mins. how long if both pumps are used.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
x/42+x/35=1
x/6+x/5=7
5x+6x=210
11x=210
x=210/11 =19 minutes and about 1 second.
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