Question

Find the time taken by a train 240 m long, running at 80 km/hr in crossing a man standing on the platform.​

Answer 1

Step-by-step explanation:

Speed = Distance/ Time

Time= Distance / Speed

Now

Time = ( 240 * 60* 60 ) / ( 80* 1000)

Time = 10.8 seconds

Answer 2

Answer:

Required time is 10.8 seconds.

Step-by-step explanation:

Given,a train 240 m long, running at 80 km/hr in crossing a man standing on the platform.

So, Distance covered by train = 240 m and speed of the train is 80 km/hr

$= 80 \times \frac{5}{18} = \frac{200}{9}$ m/s

Here we want to find time taken by the train to cover 240 m.

We know,

Distance = Speed × Time

So,Time = $\frac{Distance}{Speed}$

For example,

Let speed of car be 5 m/s and the car cover total 50 m distance.

Then time taken by car for covering 50 m distance

$= \frac{50}{5} = 10 \: seconds$

Here Distance = 240 m and speed = $\frac{200}{9}$ m/s.

Required time

$= \frac{240}{ \frac{200}{9} } \\ = 240 \times \frac{9}{200} \\ = \frac{6 \times 9}{5} \\ = \frac{54}{5} \\ = 10.8 \: seconds$

This is a problem of Speed and Distance chapter,

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