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18 September, 14:20

Anita can clean a typical pool in 8 hours. Chao can clean a typical pool in 6 hours. How long should it take Anita and Chao working together to clean a typical pool?

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  1. 18 September, 15:08
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    This kind of problems requires to add the working velocities. The total velocity is the sum of the individual velocities.

    Anita's velocity = 1 pool/8 hours

    Chao's velocity = 1 pool/6 hours

    Combined velocity 1/8 + 1/6 = (3 + 4) / 24 = 7/24 pool/hour

    Time = 1 pool / (7/24) pool/hour = 24/7 hour = 3.43 hours
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