A 130 m long train crosses a 290 m long bridge in 54 seconds. What time will it take to cross a platform 220 m long?

45 sec

Total Distance (d₁ : d₂) = (130 + 290) : (130 + 220) = 420 : 350 = 6  :  5

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

Therefore,

d₁ : d₂ = t₁ : t₂ = 6  :  5

6R = 54 sec.

1R = 9 sec

5R = 5 × 9 = 45 sec.