The expressway from Shanghai to Nanjing is 370 kilometers long. The truck departs from Nanjing and heads for Shanghai at 90 kilometers per hour. It has traveled 190 kilometers. How many hours will it take for the truck to arrive in Shanghai?
上海到南京的高速公路全长370千米，卡车从南京出发，开往上海，每小时行90千米，已经行了190千米，卡车到上海还要行几小时？
<gadget id="calculator">370 - 190</gadget>
<output>180</output>

<gadget id="calculator">180 / 90</gadget>
<output>2</output>

<result>2</result>