A person crosses a 600 m long street in 5 minutes. What is his speed in km/hr?
সমাধান
সঠিক উত্তর: Option B
distance = 680 meter time = 5 minutes = 5 x 60 seconds = 300 seconds
Speed = distance/time=600/300=2m/s=2×18/5 km/hr
=7.2km/hr