A car travels a distance of 1742 miles at an average rate of

A car travels a distance of 1742 miles at an average rate of 40 mph and returns at an average rate of 55 mph. Find the average rate for the round trip to the nearest tenth.

Find the total time:
time = distance/rate
Total time = 1742/40 + 1742/55
= 43.55 + 31.67 hours
= 75.22
------------
Total distance = 2*1742 = 3484 miles
------------------
Round trip average = distance/time = 3484/75.22 = 46.32 mph