Question

a train is running at a speed of 48 km per hour how long will it take to reach a signal at a distance of 80 metres from the starting platform

Answer 1

speed will become 40/3 m/s
distance is 80 metres
time formula = distance / speed
=80/40/3
=3X2
= 6
answer is 6 seconds

Answer 2

A train is running at a speed of 48 km per hour. It take 6 seconds to reach a signal at a distance of 80 metres from the starting platform.

Speed of the train = 48 km/hr.

To express km/hr in m/s (as the distance provided to us is in meters), we need to multiply the speed in km/hr with 5/18 as:

(1km/1hr = 1000m/3600s = 5m/18s)

So, the speed 48km/hr in m/s will be:

[48×(5÷18)]m/s

= 13.33m/s

And the distance it will cover is 80m, we know that,

Speed = (Distance)/(Time)

⇒ Time = (Distance)/(Speed)

∴ Putting the values of Distance as 80m and Speed as 13.33m/s we get Time as:

Time = (80/13.33)s

= 6s

So, the time taken by the train to cover 80m from the starting platform is 6 seconds.