A person has to cover a distance of 100km in 10hour. If he covers one half of the distance in half of the total time; to cover the remaining distance in the remaining time, his speed must be?  Choose the correct choice from the following:
A) 20km/hr
B) 15km/hr
C) 25km/hr
D) 10km/hr
E) 5km/hr
Remaining distance = 50km   Remaining time = 1/2 * 10= 
<gadget id="calculator">1/2 * 10</gadget>
<output>5</output>
5 hours   Required speed= 50*5 = 10km/hr   Answer is 10km/hr
<result>D</result>
A person has to cover a distance of 100km in 10hour. If he covers one half of the distance in half of the total time; to cover the remaining distance in the remaining time, his speed must be?