Teacher Fang and Teacher Wang went to the training school for a meeting. 0.75 hours after Mr. Fang set off, Mr. Wang rushed there by bicycle. Teacher Fang travels 9.6 kilometers per hour, and Teacher Wang travels 24 kilometers per hour. How many hours later can Teacher Wang catch up with Teacher Fang?
方老师和王老师到进修学校去开会．方老师出发0.75小时后，王老师骑自行车赶去．方老师每小时行9.6千米，王老师每小时行24千米．几小时后王老师可以赶上方老师？
<gadget id="calculator">24 - 9.6</gadget>
<output>14.4</output>

<gadget id="calculator">0.75 / 14.4</gadget>
<output>0.052083</output>

<gadget id="calculator">9.6 * 0.052083</gadget>
<output>0.499997</output>

<result>0.499997</result>