Question

A car travelled on a B classs road for 20 minutes at an average speed of 57 km /h. It then trallved a distance of 55km in 30 mins on an expressway. Find a) the distance the car travelled on the B class road. b) the average speed in km/h of the car when it travelled on the expressway​

Answer 1

hey dear

Let distance from A to B be x

Time for travel from A to B= x/20

Time for travel from B to A= x/30

Hence,speed for total distance 2x is:

30

x

+

20

x

2x

=

5x

2x×60

=24 km\hr

Answer 2

Answer:

A) as speed=D/t

so d=19 km

B) as speed = d/t

so s=110 km/hr