word problem!!!!

Question

A diesel train made a trip to Johannesburg and back. The trip there took 10 hours and the trip back took six hours. What was the diesel train's average speed on the trip if it averaged 75 mph on the return trip?

Answer 1

In order to determine the average speed for the entire trip that took of a total of 16 hours, we must calculate the total distance of the trip and divide by the total time.

The total distance is 2 * 75mph * 6 hours (twice the distance of the return trip.)

Total distance = 900 Miles

Total time = 10 + 6 = 16 hours

Average speed for the trip = 900 miles / 16 hours 56.25 miles / hour