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28 March, 20:16

Washing 2 cars and 3 trucks takes 130 minutes. washing 2 cars and 5 trucks takes 190 minutes. how long does it take to watch each type of vehicle?

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  1. 28 March, 21:28
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    2c+3t=130

    2c+5t=190

    2c+5t-2c-3t=190-130

    2t=60

    t=30

    2c+3*30=130

    2c+90=130

    2c=130-90

    2c=40

    c=20

    truck t - 30 min,

    car c - 20 min
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