A moving van leaves a house traveling at an average rate of 40 mi h. the family leaves the house half hour later following the same route in the car

average-rate

#1

a moving van leaves a house traveling at an average rate of 40 mi h. the family leaves the house half hour later following the same route in the car. they travel at an average of 60 mi h. find out how long it will take the car to catch up with the van

Answer:

1 hour. 40x+20=60x x is hours

should be 1.5 hours, actually: 40x+30=60x
4x+3=6x
3=2x
x=3/2