Natasha climbs up a hill, and descends along the same way she went up. It takes her 4 hours to reach the top and 2 hours to come back down. If her average speed along the whole journey is 4 kilometers per hour, what was her average speed (in kilometers per hour) while climbing to the top?	Choose the correct choice from the following answers:
A) 2	B) 2.5	C) 3	D) 3.25	E) 3.5
Let the distance to the top be x, so the total distance traveled by Natasha is 2x.   The total time is 4 + 2= 
<gadget id="calculator">4 + 2</gadget>
<output>6</output>
6 hours   The average speed= total distance/total time taken = 2x/6 = x/3   The average speed of the complete journey is 4 km/hour   x/3 = 4   x = 12 km   The average speed while climbing = distance/time = 12/4= 
<gadget id="calculator">12/4</gadget>
<output>3</output>
3 km/h   The answer is 3.
<result>C</result>
Natasha climbs up a hill, and descends along the same way she went up. It takes her 4 hours to reach the top and 2 hours to come back down. If her average speed along the whole journey is 4 kilometers per hour, what was her average speed (in kilometers per hour) while climbing to the top?