A car went to the provincial capital, it took 5 hours to go, and 3 hours to return. If the speed when going is 42 km/h, what is the speed when coming back?
一辆汽车去省城，去时用了5小时，回来时用了3小时．如果去时的速度是42千米/时，回来时的速度是多少？
<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">42 * (5/3)</gadget>
<output>70</output>

<result>70</result>