Single correct option
A train crosses a pole in 12 seconds and a 300-metre-long platform in 27 seconds. What is the length of the train?
- A. 200 m
- B. 240 m
- C. 260 m
- D. 300 m
Show answer and solution
Answer: (B) 240 m
When crossing a pole the train covers its own length L. When crossing the platform it covers L + 300.
The extra 300 m takes 27 − 12 = 15 s, so speed = 300/15 = 20 m/s.
L = 20 × 12 = 240 m.
Tip: subtracting the two cases removes the unknown length straight away.
The extra 300 m takes 27 − 12 = 15 s, so speed = 300/15 = 20 m/s.
L = 20 × 12 = 240 m.
Tip: subtracting the two cases removes the unknown length straight away.
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