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2 August, 12:08

krystal can wash a car in 16 minutes. sarawong can wash the same car in 15 minutes. If they work together how long would it take them?

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  1. 2 August, 12:17
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    Krystal washes the car in 16 minutes, so she can wash 1/16 of the car per minute.

    Sara washes the car in 15 minutes, so she washes 1/15 of the car per minute.

    Together they would wash: 1/16 + 1/15 = 31/240 of the car per minute.

    To wash the entire car would be: 240/31 = 7.74 minutes (7 minutes 44.5 seconds)
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