Quantitative Aptitude • Time, Speed & WorkEasy
A train 420 m long crosses a pole in 12 seconds. What is the speed of the train in km/h?
A. 35 km/h
B. 126 km/h✓ Correct Answer
C. 144 km/h
D. 9.72 km/h
💡 Solution & Explanation
To pass a pole, the train covers only its own length. Speed = 420 m ÷ 12 s = 35 m/s. To change m/s into km/h, multiply by 18/5: 35 × 18/5 = 126 km/h.
More Quantitative Aptitude Time, Speed & Work questions
- 30 workers can build a wall in 26 days. How many days will 13 workers take to build the same wall, working at…
- A boat moves at 8 km/h in still water and the stream flows at 4 km/h. How long will the boat take to go 24 km…
- Pipes A and B can fill a tank in 4 hours and 6 hours respectively, and pipe C can empty the full tank in 12…
- A boat moves at 5 km/h in still water and the stream flows at 1 km/h. How long will the boat take to go 24 km…
- Pipe A can fill a tank in 6 hours and pipe B can empty the full tank in 12 hours. If both pipes are opened…