A car travels from A to B at a speed of 60 km/h and takes 5 hours to reach the destination. When returning, the speed is 15 km/h faster than when going, how long does it take to return?
一辆汽车从甲地开往乙地速度是60千米/时，5小时达到．返回时速度比去时快15千米/时，返回时只需几小时？
<gadget id="calculator">60 + 15</gadget>
<output>75</output>

<gadget id="calculator">5 / 75</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">60 * (1/15)</gadget>
<output>4</output>

<result>4</result>