Question

Mark averaged 60 miles per hour during the 30-mile trip to college. Because of heavy traffic he was able to average only 30 miles per hour during the return trip. What was Mark's average speed for the round trip? ______ mph

Answer 1

Okay, here we have this:

Considering the provided information, we are going to calculate the average speed, so we obtain the following:

The trip to college took 30 mi/(60 mi/h) = 0.5 h

The return trip took 30 mi/(30 mi/h) = 1 h

So, we have that the total time was 1.5 hours, and the total distance was 60 miles.

So, let's find the average speed for the round trip:

Average speed=60 miles/1.5 hours=40 mph

Finally we obtain that the average speed for the round trip is 40mph.