"Travelling in a train, a man notices 13 telephone poles in two minutes. If…
2024
"Travelling in a train, a man notices 13 telephone poles in two minutes. If the two successive telephone poles are known to be 125 m apart, then the train is travelling at a speed of:"
- A.
40 km/hr
- B.
42 km/hr
- C.
45 km/hr
- D.
48 km/hr
Attempted by 3 students.
Show answer & explanation
Correct answer: C
First, calculate the number of intervals between 13 poles: 13 - 1 = 12 intervals. Next, find the total distance covered: 12 intervals × 125 m/interval = 1500 m. Convert the time to seconds: 2 minutes × 60 = 120 s. Calculate speed in m/s: 1500 m / 120 s = 12.5 m/s. Finally, convert to km/hr: 12.5 × (18/5) = 45 km/hr.