SOLUTION: When all the leaves have fallen, a girl can rake the entire yard in 8 hours. When a boy does it alone, it takes him 9 hours. How long would it take them to rake the yard together.

SOLUTION: When all the leaves have fallen, a girl can rake the entire yard in 8 hours. When a boy does it alone, it takes him 9 hours. How long would it take them to rake the yard together.

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Question 901751: When all the leaves have fallen, a girl can rake the entire yard in 8 hours. When a boy does it alone, it takes him 9 hours. How long would it take them to rake the yard together.
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

9x + 8x = 72
17x = 72
x = 72/17 hr 0r 4 4/17 hr
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