Question

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.

Answer 1

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