A bus trip of 450 miles would have taken 1 hour less if the average speed S for the trip had been greater by 5 miles per hour. What was the average speed S, in miles per hour, for the trip?
Choose one:	A) 10	B) 40	C) 45	D) 50	E) 55
(S+5)(T-1) = 450   S*T = 450   Solving both the equations, we get: S = 45 or -50   Since Speed should be positive, S = 45   Hence, option 45
<result>C</result>
A bus trip of 450 miles would have taken 1 hour less if the average speed S for the trip had been greater by 5 miles per hour. What was the average speed S, in miles per hour, for the trip?