The speed of the ostrich is 72 km/h, the speed of the African wild dog is 56 km/h, the ostrich runs in 7 hours, how many hours does the African wild dog need to run?
鸵鸟的速度是72千米/时，非洲野狗的速度是56千米/时，鸵鸟7小时跑的路程，非洲野狗需要几小时才能跑完？
<gadget id="calculator">7 / 56</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">72 * (1/8)</gadget>
<output>9</output>

<result>9</result>