what is the average speed of (a) a car that travels 400m in 20s. and (b) an athlete who runs 1500m in 4 minutes

a) 20 m/s

b) 37.5 m) s

Explanation:

Average speed = total distance : total time

=> (a) average speed of a car that travels 400m in 20s

= 400/20 = 20 m/s

& (b) average speed of an athlete who runs 1500m in 4 minutes (or 4*60=240 seconds)

= 1500/240 = 37.5 m/s