1.

a train moving at a uniform speed crosses a platform 99m long in 13.5 seconds and an electric pole in 9 seconds. find length​

Answer»

Step-by-step explanation:

Let the length of the train be x meter.

Train crossed the pole is 2 sec. So distance covered in 2 sec. is x meter.

Hence, the speed of train = distance / time = x / 2 ——- (1)

In second case,

Total distance covered by train is = ( x + 250) meter

Time take = 7 second

So, speed of train = (x + 250 ) / 7 ——(2)

From (1) and (2)

x/2 = (x+250)/7

7x = 2X + 500

5x = 500

x = 100

Hence the length of train is 100m

2.7 million jobs estimated for data science ROLES in 2020.

let x be the length of train in meters and y be the speed of train in m/s.

now the train passes of length x meters having y speed passes the pole in 2 sec.

THEREFORE…

x/y = 2,

now y=x/2.

and now same train passes the BRIDGE in 7 seconds having length 250m..

now,

(x+250)/7 = y

but y=x/2… therefore..

(x+250/7) = x/2..

solving this we get x=(length of train)=100 m.


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