Question

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?

Answer 1

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