Question

A car covers 30km/hr at a uniform speed of 30km/hr.what should be it speed for the next 90km if the average speed for the entire journey is 60km/hr.

Answer 1

Answer:

Explanation:

Total distance = 30+90=120

If avg. spd is 60 km/h then total time to cover the dist. is 2 hour.

Avg spd.= (30+x)/2

distance=spd * time

120=(30+x)/2*2

120=30+x

x=120-30=90

i.e Speed = 90 km/h................