The army conducts camping training. It departs from the station at 7:00 in the morning and travels 5 kilometers per hour. It takes 1 hour to eat on the way. At 3:00 p.m., the army sends people to send them emergency notifications on bicycles and travels 19 kilometers per hour. How many hours? Can catch up later.
军队进行野营训练，早晨7时从驻地出发，每小时行5千米，在途中吃饭用去1小时，下午3时部队派人骑自行车给他们送紧急通知，每小时行19千米，多少小时后可追上．
<gadget id="calculator">19 - 5</gadget>
<output>14</output>

<gadget id="calculator">7 / 14</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5 * (1/2)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>