An emergency vehicle travels 10 miles at a speed of 50 miles per hour. How fast must the vehicle travel on the return trip if the round-trip travel time is to be 20 minutes?

An emergency vehicle travels 10 miles at a speed of 50 miles per hour.

1.	An emergency vehicle travels 10 miles at a speed of 50 miles per hour. How fast must the vehicle travel on the return trip if the round-trip travel time is to be 20 minutes?
A.	72 miles per hour
B.	75 miles per hour
C.	65 miles per hour
D.	78 miles per hour
Answer» C. 65 miles per hour