In a 100 m race, A runs at 8km per hour. If A gives B a start of 6 m and still him by 15 seconds, what is the speed of B ? Choose the correct choice.
A) 5.56 km/hr.
B) 5.06 km/hr.
C) 5.64 km/hr.
D) 6.76 km/hr.
E) 5.72 km/hr.
Time taken by A to cover 100 m =(60 X 60 / 8000)	x 100 sec = 45 sec.   B covers (100 - 6)= 
<gadget id="calculator">(100 - 6)</gadget>
<output>94</output>
94m in   (45 + 15)= 
<gadget id="calculator">  (45 + 15)</gadget>
<output>60</output>
60 sec.   B's speed= (94 x 60 x 60)/(60 x 1000)km/hr = 5.64 km/hr.   Answer is 5.64 km/hr.
<result>C</result>
In a 100 m race, A runs at 8km per hour. If A gives B a start of 6 m and still him by 15 seconds, what is the speed of B ?