The second part of the trip would take 1.5 hours.
Speed is the ratio of the total distance travelled to total time taken. It is given by:
Speed = distance/time
Since the total distance is 175 miles at an average speed of 50 mph. Hence the total time is:
Speed = distance/time
50 = 175/time
time = 175/50
Time = 3.5 hours
Since the first trip takes 2 hours, the time needed for the second trip is:
Total time = time for first trip + time for second trip
3.5 hours = 2 hours + Time for second trip
Time for second trip = 1.5 hours
The second part of the trip would take 1.5 hours.
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