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14 December, 18:56

sam can mow his yard in 5 hours. Lucy can mow the same yard in 3.5 hours. How long will it take them to mow the lawn together?

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  1. 14 December, 21:30
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    Sam workrate 1/5

    Lucy workrate 1/3.5 = reciprocal of 7/2 = 2/7

    combined workrate: 1/5 + 2/7 = 17/35

    they will mow the lawn in 35/17 = 2 and 1/17 hours

    2 hours 3 1/2 mins
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