Question

 A train 160 m long crosses a pole in 12 seconds . Find the speed of train in km/hr .

(i) 54 km/hr

(ii) 64 km/hr

(iii) 84 km/hr

(iv) 48 km/hr
​

Answer 1

Answer:

48 Km/hr

Step-by-step explanation:

160m=0.16km

12s=0.0033hr

speed= distance/time

here distance is the length of train

speed= 0.16/0.0033

=48km/hr

Answer 2

Final Answer:

The speed of the train 160 m long which crosses a pole in 12 seconds, in km/hr is 48 km/hr.

Given:

The train which is 160 m long is said to cross a pole in 12 seconds. Find the .

To Find:

The speed of the train which is 160 m long is said to cross a pole in 12 seconds, in km/hr is to be calculated.

Explanation:

The concept of speed is applicable to arrive at the solution to the present problem.

Speed of the train is the distance covered by the train divided by the time taken by the train to cover that distance.

There are sixty seconds in one minute and sixty minutes in one hour.

The distance of 1 km is equal to 1000 m.

Step 1 of 3

As per the statement given in the problem, the train crossing the pole in 12 seconds, is in fact covering the distance of 160m.

Step 2 of 3

Using the above information, the distance covered in 1 second is

$=\frac{160}{12}\;m$

So, the distance covered in $60\times 60$ seconds or 1 hour is

$=\frac{160\times 60\times 60 }{12}\;m\\\\=\frac{160\times 60\times 60 }{12\times 1000}\;km$

Step 3 of 3

In continuation with the above calculations, the speed of the train is

$\frac{160\times 60\times 60 }{12\times 1000}\\\\=48\;km/hr$

Therefore, the required correct answer is option (iv) that indicates the required speed of 48 km/hr.

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