A person crosses a road 350 metres wide in 70 seconds. His speed (in km/h) is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 18.
Speed (in km/h) = (Distance (in meters) / Time (in seconds)) × 18/5
Distance = 350 meters
Time = 70 seconds
Speed (in km/h) = (350 / 70) × 18/5
⇒ Speed (in km/h) = 5 × 18/5
⇒ Speed (in km/h) = 18 km/h