Question

a boy uns 500m in 1min40s, which is the speed in m/s?

Answer 1

speed
=distance/time
=500/(1x60+40)
=5 m/s

Answer 2

speed = distance travelled / time
= 500/ (60+40) <--- convert to 1 min to 60s so total time =60+40
=5 m/s