4 kilometres per hour.
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Well, honey, if that student walks 2 km in 30 minutes, you just divide the distance by the time. So, 2 km divided by 0.5 hours (which is 30 minutes in hours) gives you an average speed of 4 km/h. Math doesn't lie, darling.
Average speed is about 6 mph.
If you run 2.5 miles in 20 minutes your average speed is 7.5 miles per hour.
15km/hour
40mph
Traveling 117 miles in 2 hours and 15 minutes means the average speed is 52 miles per hour. (Divide 117 by 2.25)