- A20 km/h
- B60 km/h
- C80 km/h
- D72 km/h
Step-by-Step Solution
Extra 120 m takes extra 6 , so speed = 20 m/ km/h. (Train length = m.)
Answer: D) 72 km/h
A train crosses a 120 m platform in 15 seconds and a 240 m platform in 21 seconds. What is its speed?
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