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 1.5 kilometers per hour, what was her average speed (in kilometers per hour) while climbing to the top?	Choices
A) 1.065	B) 1.125	C) 1.225	D) 1.375	E) 1.425
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 1.5 km/hour   x/3 = 1.5   x = 4.5 km   The average speed while climbing = distance/time = 4.5/4= 
<gadget id="calculator">4.5/4</gadget>
<output>1.125</output>
1.125 km/h   The answer is 1.125.
<result>B</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 1.5 kilometers per hour, what was her average speed (in kilometers per hour) while climbing to the top?