Question

A train running at the speed of 160 km/hr crosses a pole in 9 seconds. What is the length of the train?

Answer 1

Answer:

Given data:

Speed (v) of train = 60 km/hr.

And it takes 9 seconds to cross a pole.

Therefore time (t) = 9 seconds.

Now as we know 1 km = 1000 meter.

And 1 hr. = 3600 sec.

So 1(km/hr.) = (1000/3600) = (5/18) meter/seconds

So 60 km/hr. = 60×518=503 m/sec.

So the speed (v) of the train = 503 m/sec.

Now as we know speed (v), distance (s) and time (t) is related as

s=v×t Units.

Now let the length of the train be l m.

⇒l=v×t Meters.

Now substitute the values in above equation we have,

⇒l=503×9=150 Meters.

So this is the required answer.