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Word Problems, Work/Rate Problems

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by swerve » Fri Jun 26, 2020 4:22 am

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A

B

C

D

E

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A farm used two harvesting machines, H and K, to harvest 100 acres of wheat. Harvesting machine H, working alone at its constant rate, harvested 40 acres of wheat in 8 hours. Then harvesting machine K was brought in, and harvesting machines H and K, working together at their respective constant rates, harvested the remaining acres of wheat in 5 hours. Harvesting machine K harvested how many acres of wheat per hour?

A. 7
B. 8
C. 12
D. 13
E. 15

The OA is A

Source: GMAT Prep
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