Question

A 300 metre long train crosses a platform in 39 seconds while it crosses a signal pole in 18 seconds. What is the length of the platform?

Answer 1

length of train= 300m 
time taken to cross platform= 39 sec
time taken to cross signal pole= 18 sec
speed of the train while crossing platform = 300/39= 7.69m/sec
speed= distance/time
7.69= distance/39
hence distance = 7.69*39= 299.91m

Answer 2

Answer:

350

Step-by-step explanation:

Let, Length of the Platform = x

Speed = 300/18

           = 50/3 m/s

Total Distance = 300 + x

Distance/Time = Speed

or, ( 300 + x )/39 = 50/3

or, 3( x + 300 ) = 1950

or, x = 350

..............Thanks..............