A man walks at a speed of 2 km/hr and runs at a speed of 6 km/hr. How much time will the man require to cover a distance of 20 1/2 km, if he completes half of the distance, i.e., (10 1/4) km on foot and the other half by running ?  Choose the correct choice from the following choices:
A) 41.9 hrs
B) 11.9 hrs
C) 61.9 hrs
D) 17.9 hrs
E) 71.9 hrs
Explanation:   We know that   Time = Distance/speed   Required time = (10 1/4)/2 + (10 1/4)/6   = 41/8 + 41/6   = 287/24 = 11.9 hours.   Answer: 11.9 hrs
<result>B</result>
A man walks at a speed of 2 km/hr and runs at a speed of 6 km/hr. How much time will the man require to cover a distance of 20 1/2 km, if he completes half of the distance, i.e., (10 1/4) km on foot and the other half by running ?