Question

On a 200 km track, a train travels the first 50 km
at a uniform speed of 40 km/h. How fast the train
must travel the next 150 km so as to maintain the
average speed of 60 km/h for the whole journey?​

Answer 1

Answer:

The remaining distance is 200 - 50 = 150 km. So the speed is. So train have to maintain average 72 km/hr speed to make total average speed of 60 km/hr. t1 = 5/4 hrs.

MARK AS BRIANLIST

Answer 2

$\sf \pmb{Answer :}$

time =200/60=20/6

average speed=Total distance/Total time

Time taken 50km=5/4

remaining time=20/6-5/4=25/12

speed=distance/time

150*12/25=72

remaining speed=72km/h