Question

a train 250 m long passes a pole in 12 seconds.what the speed of train in km/hour​

Answer 1

Answer:

So the train has travelled 250m in 15 seconds, which is a quarter of a minute.

so that equates to 1000 m (250*4) or 1km in a minute

we got here by multiplying the original time by 4 to get the distance per minute.

how are we going to get the figure from minutes to hours?

did someone say multiply by the number of minutes in an hour?

well if they did…… they are right,!

so multiply 1km by this new number to get the answer in km/hr

Train takes

15 Seconds to cross 250 m

So in 1 Second it will cross 250/15 m

In 3600 Seconds (1 hour) it will cross 250/15x3600 or 60,000 m (60 Km)

Train is running at at a speed of 60 Kilo Meters per hour