Question

its takes 400 seconds for a train to completely cross two points A and B which are at distance of 7 .8km. What is the speed of train,if length of the train is 200m

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Answer 1

Answer:

distance of 7.8kilometres⇔7800metres + 200 metre length of the train to completely cross A and B =7800+200=8000metres! because the length of the train becomes part of the distance after!

$speed=\frac{distance}{time} = \frac{8000metres}{400seconds} = 20m/s$

Step-by-step explanation: