A train runs at 90 km/h. It crosses a pole in 20 seconds. What is the length of the train?
- 520 m
- 450 m
- 500 m
- None of these
Explanation
Given:
Speed = 90 km/h
Time = 20 seconds
First, convert speed to m/s:
Speed = 90 km/h × (1000 m/km) / (3600 s/h)
Speed = 25 m/s
Length of the train = Speed × Time
Length = 25 m/s × 20 s
Length = 500 m
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