A freight train operator knows that on a 200-mile trip, if the freight cars are not fully loaded, she can save 1 hour of travel time by increasing her normal speed by 10 miles per hour. What is her normal speed in miles per hour?
A. 40
B. 45
C. 55
D. 60
Answer:A
A freight train operator knows that on a 200-mile trip, if the freight cars are not fully loaded, she can save 1 hour of travel time by increasing her normal speed by 10 miles per hour. What is her normal speed in miles per hour?
A. 40 B. 45 C. 55 D. 60
Explanation: A