Medium
A train 150 m long passes a telegraph pole in 15 seconds. Find the speed of the train in km/h.
Explanation
Explanation
Step 1: To pass a pole, the train covers a distance equal to its own length = 150 m.
Step 2: Speed = distance ÷ time = 150 ÷ 15 = 10 m/s.
Step 3: Convert m/s to km/h by multiplying with 18/5: 10 × 18/5 = 36 km/h.
Step 4: Check: 36 km/h = 36000 m ÷ 3600 s = 10 m/s ✓.
Answer: 36 km/h.
PRO TIP
Re-check your working by substituting the answer back into the original question.