Question

During the same journey, Stuart drove x miles for 2 hours, and 200 miles for 3 hours. Find x

if the average speed for the entire journey is 70 miles per hour

Answer 1

x = 150

Explanation:

The relationship between time, speed, and distance is ...

speed = distance/time

70 mi/h = (200 +x mi)/(3 +2 h)

350 mi = 200 +x mi

150 mi = x mi

Stuart drove 150 miles in 2 hours to make the average speed 70 mi/h.