Question

A car travels 40 km at a uniform speed of 40km/h. what should be its speed for the next 80km if the average speed of the entire journey is 60km/h?​

Answer 1

Answer:

80kmph

Explanation:

1st case:

distance= 40km

speed(v1)=40kmph

t=1 hr

2nd case:

distance=80km

speed(v2)=?

time=1hr

For equal time interval...

Average speed=(v1+v2)/2

=(40+v2)/2=60

=40+v2=120

=v2=120-40= 80kmph......(Ans)