A 500 metre long train is running at a speed of 90 km/hr. It will cross a 250 metre long railway bridge in : Option 1: 50 seconds Option 2: 20 seconds Option 3: 30 seconds Option 4: 40 seconds

Answer: 30 seconds. Solution: Convert speed: 90 km/hr = 90 x 5/18 = 25 m/s. Total distance = train + bridge = 500 + 250 = 750 m. Time = 750/25 = 30 seconds, which matches option 3.

Arithmetic

Time, Speed & Distance

Easy

A 500 metre long train is running at a speed of 90 km/hr. It will cross a 250 metre long railway bridge in :

50 seconds

20 seconds

30 seconds

40 seconds

✅ Correct Option: 3

Convert speed: $90 \text{ km/hr} = 90 \times \frac{5}{18} = 25$ m/s. Total distance = train + bridge = $500 + 250 = 750$ m. Time = $\frac{750}{25} = 30$ seconds, which matches option 3.

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