Question

A car travels the first 30 km with a uniform speed of 60 km h -1 and the next 30 km with a uniform speed of 40 km.h -1 . Calculate The total time of journey and The average speed of the car.

Answer 1

Step-by-step explanation:

let distance=d

time=t and speed=s

d1=30, S1=60

t=d/s

t1=30/60=1/2hr

D2=30

s2=40

t2=D2/s2

t2=30/40=3/4hr

total time= t1+t2=1/2+3/4

=5/4hrs

average speed=total distance/total time

avg.speed=30+30/5/4

=60×4/5

average speed=48km/hr

hope it helps you!