Asked by Broly

if one machine can do a piece of work in 10 hours and a second machine can do the same work in 15 hours, how many hours will it take both machines simultaneously to do the work?
A) 12.5
B) 25
C) 5
D) 6
Answered by oobleck
1/10 + 1/15 = 1/x
solve for x
Answered by B)
its 25
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