If a man crosses a 650 m long street in 5 minutes. What is his speed?  Pick:
A) 7 km/hr  B) 7.1 km/hr  C) 7.8 km/hr  D) 8 km/hr  E) 8.5 km/hr
distance = 650 meter   time = 5 minutes = 5 x 60 seconds = 300 seconds   Speed = distance/time=650/300=2.17m/s   =2.17×18/5=7.8 km/hr   7.8 km/hr
<result>C</result>
If a man crosses a 650 m long street in 5 minutes. What is his speed?