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?
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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
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