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? Choose the correct choice from the following:
A) 4 B) 5 C) 6 D) 8 E) 9
Required time = (9)/3 + (9)/9= 
<gadget id="calculator">(9)/3 + (9)/9</gadget>
<output>4</output>
4 hours.   4nswer:4
<result>A</result>
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?