Dhanush crosses a road 100 metres wide in 50 seconds. His speed in km/hr is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 7.2 km/h
Speed = Distance / Time
Speed = 100 / 50
Speed = 2 m/s
Convert m/s to km/h: multiply by 18/5
Speed = 2 × 18/5
Speed = 36/5
Speed = 7.2 km/h