Question

Two cars, 129 miles apart, start moving towards each other at the same time. one is moving 3 times as fast as the other. if they meet 2.0 hrs later, find the average speed of the slower car in miles per hour?

Answer 1

x – slower car

3x faster car

D = distance traveled by slower car

D = distance traveled by faster car

D+d = 129

Both cars traveled for 2 hours

D=2x

d=2(3x) = 6x

2x+6x = 129

8x = 129

x=129/8 = 16.125 miles per hour