Mr. Wang can get there in 6 hours if he walks 4 kilometers per hour from A to B. How many hours will it take to travel 8 kilometers per hour after changing to riding a bicycle?
王老师从甲地到乙地，如果每小时走4千米，6小时就可以到达．改骑自行车后每小时行8千米，需要几小时可以到达？
<gadget id="calculator">6 / 8</gadget>
<output>3/4 = around 0.75</output>

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

<result>3</result>