A 300 m long train crosses a platform in 54 sec while it crosses a signal pole in 18 sec.

A 300 m long train crosses a platform in 54 sec while it crosses a signal pole in 18 sec. What is the length of the platform?

Answer/Solution

600

Steps/Work

Speed = 300/18 = 50/3 m/sec.
Let the length of the platform be x meters.
Then, (x + 300)/54 = 50/3
3x + 900 = 2700 => x = 600 m.
Answer: C