A person crosses a 400m long street in 6 minnutes. What is his speed in km per hour?	Pick one:
A) 5.8km/hr
B) 7.2km/hr
C) 9km/hr
D) 2.5km/hr
E) 4km/hr
Speed = 400/6*60 = 1.11m/sec   =1.11*18/5   =4km/hr   Answer is 4km/hr
<result>E</result>
A person crosses a 400m long street in 6 minnutes. What is his speed in km per hour?