Xiaohong rides a bicycle from place A to place B. After 1.5 hours, she has covered 60% of the journey, and she is still 15 kilometers away from place B. How many kilometers does Xiaohong travel per hour on this bicycle?
小红骑一辆自行车从甲地去乙地，1.5小时后已经行了全程的60%，距乙地还有15千米．小红骑这辆自行车每小时行多少千米？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">15 / (2/5)</gadget>
<output>75/2 = around 37.5</output>

<gadget id="calculator">(75/2) - 15</gadget>
<output>45/2 = around 22.5</output>

<gadget id="calculator">(45/2) / 1.5</gadget>
<output>15</output>

<result>15</result>