a man walks 0.9 miles around a shopping mall in half an hour what is his speed in miles per hour, in meters per second, and kilometers per day/?

V = 0.9mi/0.5h = 1.8 mi/h.

V = 1.8 mi/h * 1600m/mi * 1h/3600s = 0.8 m/s.

V = 0.8m/s * 1km/1000m * 3600s/h * 24h/day = 69.12 km/day.