Question

a body cover 20km with 18km/hr and next 40km with 36km/hr.find its average velocity

Answer 1

Distance₁=20 km.
Speed₁=18 km/h.
Time₁= distance₁/Speed₁.
= 20/18.
=1.11 hours.
Distance₂=40 km.
Speed₂=36 km/h.
Time₂= distance₂/Speed₂.
= 40/36.
= 1.11 hours.

Average speed = total distance / total time.
= 20+40 / 1.11+1.11.
= 60/2.22.
=600/222.
=27.027 km/h.

Therefore, the average speed = 27.027 km/h.