The road between Yibin City and Luzhou City is 175km long, and the designer Liu Hua sent the materials from Yibin City to Luzhou City by bicycle. After driving 85km, Liu Hua drove to Luzhou at a speed of 45km per hour due to the urgent task. May I ask how long it will take him to reach Luzhou?
宜宾市到泸州市之间的公路长175km，设计师刘华骑车将资料从宜宾市送往泸州市．行驶85km后，由于任务紧急，刘华以每时45km的速度向泸州驶去．请问他还需要多少时间才能到达泸州市？
<gadget id="calculator">175 - 85</gadget>
<output>90</output>

<gadget id="calculator">90 / 45</gadget>
<output>2</output>

<result>2</result>