The enemy army started to flee 7 kilometers away from our army. The time was 5:00 in the morning. Our army set out to catch up at 5:15, the speed was 1.5 times that of the enemy army, and caught up with the enemy army at 7:45. What is the speed of our army in kilometers per hour?
敌军在离我军7千米的地方开始逃跑，时间是早上5点，我军于5点15分出发追及，速度是敌军的1.5倍，在7点45分追上敌军．求我军速度是每小时多少千米？
<gadget id="calculator">2.5 * 1.5</gadget>
<output>3.75</output>

<gadget id="calculator">3.75 - 2.75</gadget>
<output>1</output>

<gadget id="calculator">7 / 1</gadget>
<output>7</output>

<gadget id="calculator">7 * 1.5</gadget>
<output>10.5</output>

<result>10.5</result>