- A80 km/h
- B72 km/h
- C20 km/h
- D64 km/h
Step-by-Step Solution
The extra 120 m takes 6 s → 20 m/s km/h. (The train is m long.)
Answer: B) 72 km/h
A train crosses a 180 m platform in 21 seconds and a 300 m bridge in 27 seconds. What is its speed?
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