car travels from A to B at a speed of 63 km/h and takes 4 hours. It only took 3 hours to return, what was the speed of the car when it returned?
一辆汽车从甲地开往乙地，去时的速度是63千米/时，共用了4小时．返回时只用了3小时，这辆汽车返回时的速度是多少？
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">63 * (4/3)</gadget>
<output>84</output>

<result>84</result>