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13 October, 00:20

Washing 2 cars and 3 trucks take 130 minutes. Washing 2 cars and 5 trucks take 190 minutes. How long does it take to wash one car and one truck? Show your work and explain your reasoning in the space provided below.

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  1. 13 October, 00:45
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    It takes 30 minutes for 1 truck and 20 minutes for 1 car. Therefore it will take 50 minutes to wash one car and one truck. 190-130 = 60. 5 trucks - 3trucks = 2 trucks. 60/2 = 30 minutes per truck. Then 130 - 2 trucks (60 minutes) = 40. 40/2 (cars) = 20 minutes per car
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