A man walks at a speed of 3 km/hr and runs at a speed of 9 km/hr. How much time will the man require to cover a distance of 18 km, if he completes half of the distance, i.e., (9) km on foot and the other half by running?
Options:
(A) 4
(B) 5
(C) 6
(D) 8
(E) 9 Think first, then make a decision. Some random thoughts:
Required time = (9)/3 + (9)/9 = 4 hours. So the answer is (A).