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11 February, 05:08

John can clear a lot in 1.5 hours. His partner can do the same job in 4.5 hours. How long will it take them to clear the lot working together?

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  1. 11 February, 07:15
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    1.125 h = 1h 7.5 min = 1 h 7 min 30 sec

    Step-by-step explanation:

    John makes 1/1.5 work per h.

    His partner makes 1/4.5 work per h.

    Together they make (1/1.5 + 1/4.5) = (3/4.5 + 1/4.5) = 4/4.5 work per h.

    They will work

    1 : 4/4.5 = 4.5/4 = 1.125 h = 1 h + 0.125 h = 1h + 0.125h*60min/1h =

    =1h 7.5 min = 1 h 7 min 30 sec
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