Question

A train running at a speed of 45 km/h
crosses a platform 300 m long in 40 s. Find
the length of the train.​

Answer 1

Answer:

200 metres

Step-by-step explanation:

speed of train = 45 km/h

To make this into equal units as asked,

speed of the train = 45 × 5/18

= 25/2

Speed = distance/ time

This means that the train travels 25m in 2s.

In 2s it travels 25m

Then, in 40s it should travel

$\frac{40 \times 25}{2}$

= 500

So, from this we find that the train should travel 500m.

But, it travels 300m in the same time, that is, 40s.

So, to find the length of the train, we should subtract the distance it travels from the distance it should travel.

This means that,

Length of the train = 500 - 300

= 200m

Hence, the length of the train is 200m.

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