Step 1: Rajdhani crosses a platform equal to its length in 36 sec.
Let length of Rajdhani = L meters ⇒ Platform = L meters ⇒ Total distance = 2L meters
Speed = 54 km/hr = 15 m/s
So, 2L = 15 × 36 = 540 ⇒ L = 270 m
Step 2: Duronto (length 230 m) crosses same platform (270 m) = total distance = 500 m
Time = 25 sec
Speed = Distance / Time = 500 / 25 = 20 m/s
Convert to km/hr: 20 × 18 / 5 = 72 km/hr
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