A person crosses a 400m long street in 10minnutes. What is his speed in km per hour?
Choose the correct choice from the following choices:
A) 6.4km/hr
B) 7.9km/hr
C) 1.5km/hr
D) 2.4km/hr
E) 8km/hr
Speed = 400/10*60 = 2/3m/sec   =2/3*18/5= 
<gadget id="calculator">2/3*18/5</gadget>
<output>12/5 = around 2.4</output>
2.4km/hr   Answer is 2.4km/hr
<result>D</result>
A person crosses a 400m long street in 10minnutes. What is his speed in km per hour?