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 2 kilometers per hour, what was her average speed (in kilometers per hour) while climbing to the top? Choose the correct answer.
A) 1.5 B) 2.5 C) 3.75 D) 5 E) 7.5
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 2 km/hour   x/3 = 2   x = 6 km   The average speed while climbing = distance/time = 6/4= 
<gadget id="calculator">6/4</gadget>
<output>3/2 = around 1.5</output>
1.5 km/h   The answer is 1.5.
<result>A</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 2 kilometers per hour, what was her average speed (in kilometers per hour) while climbing to the top?