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14 March, 00:07

Jerry can detail a car by himself in 50 minutes. sally does the same job in 1 hour. how long will it take them to detail a car working together?

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  1. 14 March, 02:11
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    Jerry:

    50 mins = 1 detailed car

    1 min = 1/50 of the details

    Sally:

    60 mins = 1 detailed car

    1 min = 1/60 of the details

    If they work together:

    1 min = 1/50 + 1/60 = 11/300 of the details

    Total time needed:

    300 : 11 = 27.27 mins

    Answer: They will need 27.27 mins if they worked together.
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