Average speed = (distance covered) divided by (time to cover the distance) =
100/5 = 20 miles per hour
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100 miles/50 seconds= 2 miles per second average speed
Average speed = distance/time = 100/4 miles per hour = 25 mph.
The average speed is exactly (100 miles per 5.5 hours).In a more familiar unit:100/5.5 = 182/11 miles per hour = 18.182 mph (rounded)
40mph
It will take you 17.05 seconds to run 100 yards.