A man travels a distance of 20 miles at 60 miles per hour and then returns over the same route at 40 miles per hour.what is his average rate for the round trip in miles per hour?
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Answer:
24miles/hr.
Step-by-step explanation:
Distance=20miles
speed =60miles/hr.
Time=20/60=1/3hr.
speed=40miles/hr.
Time=20/40=1/2
Total time=1/3+1/2
=5/6hr.
Total distance=20miles
Average speed=Total distance/Total time
=20/5/6=24miles/hr.
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