A truck driver must complete a 180 mile trip in 4 hours. If his average speed is 50 miles per hour for first 3 hours, then how fast must he travel for the final hour?

A truck driver must complete a 180 mile trip in 4 hours. If his average speed is 50 miles per hour for first 3 hours, then how fast must he travel for the final hour?

A 25

B 35

C 40

D 30

Solution

Correct Answer: Option D