Question

a train 360 M long is running at a speed of 45 km per hour and crosses the platform in 40 seconds find the length of the platform(answer-140 metre)​

Answer 1

Answer:

length of platform = 140 m.

Step-by-step explanation:

let length of platform = x

total distance travelled by train to cross platform= (360+x) M

speed = 45 km/hr = 45× 5/18 m/s

= 25/2 m/s

dist = speed × time

360+x = (25/2 ) × 40

360+x = 25×20

360+x = 500

x = 500- 360

x = 140 m

Answer 2

Correct Question :

A train 360 m long is running at a speed of 45 km/hr and crosses the platform in 40 seconds. Find the length of the platform.

Solution :

• Length of train = 360 m

• Speed of train = 45 km/hr

=> 45 × 5/18

=> 12.5 m/s

• Time = 40 sec

___________ [ GIVEN ]

• We have to find the length of platform.

______________________________

Let length of platform be "M"

___________ [ ASSUME ]

Now..

》 Total distance covered by train = Length of train + Length of platform

=> 360 + M

We know that

》Speed = Distance/Time

Put the known values in above formula

=> 12.5 = (360 + M)/40

Cross multiply them

=> 40(12.5) = 360 + M

=> 500 = 360 + M

=> 500 - 360 = M

=> 140 = M

=> M = 140 (Length of platform)

_______________________________

Length of platform = 140 m

______________ [ ANSWER ]

_______________________________