A train of length 150 metres, moving at a speed of 90 km/hr can cross a 200 metre bridge in

Distance the train must cover to clear the bridge equals its own length plus the bridge length: 150 m + 200 m = 350 m. Convert speed to m/s: 90 km/hr = 90 × (5/18) = 25 m/s. Use time = distance ÷ speed: t = 350 m ÷ 25 m/s = 14 s. The standard approach for train‑bridge problems is to add train and bridge lengths for total distance and use consistent SI units (m and s) for the speed conversion, as shown in train problem examples and formula summaries. Hence the train crosses the 200 m bridge in 14 seconds, matching option 2.