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?

We are given:

• Length of train = 300 m
• Time to cross platform = 39 sec
• Time to cross signal pole = 18 sec

Step 1: Calculate train speed
Speed = Distance / Time= 300 / 18 = 16.67 m/s

Step 2: Distance covered when crossing platform
= Speed × Time = 16.67 × 39 = 650 m

Step 3: Subtract train length to find platform length
Platform length = 650 – 300 = 350 meters