Question

If a train has to travel a distance of 180km out of which first 100km it travelled with a speed of 50km/h then what should be the speed of the remaining distance such that the average speed of the whole journey becomes 45km/h?​

Answer 1

Answer:

To complete 1km distance with speed =50kmhr it tkes time t

1

=

50

1

s

To complete 1km distance with speed =40kmhr it tkes time t

1

=

40

1

s

Average speed=

(1/50)+(1/40)

1+1

=44.44m/s