A bus trip of 550 miles would have taken 1 hour less if the average speed V for the trip had been greater by 5 miles per hour. What was the average speed V, in miles per hour, for the trip?  Select the correct option.
A) 40
B) 45
C) 50
D) 55
E) 60
The time is the distance/speed. The time difference is 1 hour.   550/V - 550/(V+5) = 1   550(V+5) - 550V = (V)(V+5)   2750 = (V)(V+5)   50*55 = (V)(V+5)   V = 50 mph   The answer is 50.
<result>C</result>
A bus trip of 550 miles would have taken 1 hour less if the average speed V for the trip had been greater by 5 miles per hour. What was the average speed V, in miles per hour, for the trip?