Question

A 60 m long train moving with uniform speed crosses a 120 m long bridge in 12 second. The speed of the train is 36 km/h 54 km/h 72 km/h 18 km/h​

Answer 1

Answer:

Required speed of the train is 15 m/s.

Explanation:

Given, Length of the train $= 60 \: m$

Length of the bridge $= 120 \: m$

The train took time for crossing bridge $= 12 second.$

We know ,

$Speed = \frac{distance}{time} ......(1) =\frac{Length \: of \: the \: train+ Length \: of \: the \: bridge}{time} = \frac{60 + 120}{12} = \frac{180}{12} = 15 \: m {s}^{ - 1}$

Required speed of the train is 15 m/s.

By equation (1) we can find value of speed, time and distance alternatively.

Answer 2

Answer:

reqired speed trasin is 15m/s

Explanation:

Given, Length of the train=60m

Length of the bridge =120m

The train took time for crossing bridge =12sec

We know that

speed = distence/time

            =length of train + length of the bridge /time

          = 60+120/12

          =180/12

           =15m/s

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