A man in a train notices that he can count 31 telephone poles in one minute.…
2020
A man in a train notices that he can count 31 telephone poles in one minute. If the poles are at equal intervals of 50m, what is the speed of the train?
Answer: D. 90 km/hour — Counting 31 poles means the train passes 30 intervals. Distance covered in 1 minute = 30 x 50 m = 1500 m. Speed = 1500 m/min = 90 km/h.
- A.
50 km/hour
- B.
60 km/hour
- C.
80 km/hour
- D.
90 km/hour
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Correct answer: D
Counting 31 poles means the train passes 30 intervals. Distance covered in 1 minute = 30 x 50 m = 1500 m. Speed = 1500 m/min = 90 km/h.
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