SOLUTION: peggy ann can wire a room in 9 hours. matthew can wire the same room in 7 hours. how long would it take if they worked together?

SOLUTION: peggy ann can wire a room in 9 hours. matthew can wire the same room in 7 hours. how long would it take if they worked together?

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Question 845395: peggy ann can wire a room in 9 hours. matthew can wire the same room in 7 hours. how long would it take if they worked together?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
1/9+1/7=1/x
7/63+9/63=1/x
16/63=1/x
63/13=x

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