A 120 m long train crosses a 330 m long bridge in 35 seconds. What time will it take to cross a platform 240 m long?

28 sec

Total Distance (d₁ : d₂) = (120 + 330) : (120 + 240) = 450 : 360 = 5  :  4

As speed is same, then ratio of time & distance will be directly proportional.

Therefore,

d₁ : d₂ = t₁ : t₂ = 5  :  4

5R = 35 sec.

1R = 7 sec

4R = 4 × 7 = 28 sec.