Student: A man walks at a speed of 2 km/hr and runs at a speed of 7 km/hr. How much time will the man require to cover a distance of 10 1/2 km, if he completes half of the distance, i.e., (5 1/4) km on foot and the other half by running?
Options:
(A) 4 5/2 hours.
(B) 2 5/2 hours.
(C) 3 5/2 hours.
(D) 5 5/2 hours.
(E) 8 5/2 hours..
Another student: Let's say, hmmm...

Required time = (5 1/4)/2 + (5 1/4)/7 = 3 5/2 hours. Final answer: (C).