Question

51. A train went 300 miles from city X to city Y at an average speed of 80 mph. At what speed did it travel on the way back if its' average speed for the whole trip was 100 mph? CB125 mph A.120 mph 1 C. 133 mph 3 D.137-mph ​

Answer 1

Explanation:

Need to find the TIME for the total round trip of 600 miles

d / rate = time

600 mi / 100 mi/hr = 6 hrs total time

The FIRST part of the trip took : 300 mi / 80 m/hr = 3.75 hr

the return trip then took 2. 25 hrs (for a total time of 6 hrs)

then the train travelled 300 mi in 2.25 hours

300 mi / 2.25 hr = 133.33 mph on the return ===> Answer 'C'