Required time = (9)/3 + (9)/9 = 4 hours.
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:
  - 4
  - 5
  - 6
  - 8
  - 9