Question

Jake has timed that a train takes 40 seconds to cross the platform he is standing on while it takes just 15 seconds to cross him. If the average speed of train is 90 kmph, what is the length of the platform in meters?

Answer 1

speed of train =90kmph=25m/s
time taken to cross Jake=15s
length of train =25*15=375m
time taken to cross platform=40s
length of (platform+ train)=40*25=1000m
length of platform=625m

Answer 2

Answer:625m

Step-by-step explanation:

It takes 15 sec for the train to cross the boy so the length of the train must be 90*1000*15/3600 m=375m

It took 40sec to cross the platform,i.e.,to travel the distance=length of train+platform and in 40 sec the distance travelled by the train was 40*90*1000/3600m =1000m

So the length of platform is 1000-375=625m