A ship travels from port A to port B in 4.5 hours (5/8). At this speed, how many hours will it take to reach Port B?
一艘轮船从甲港到乙港，4.5小时行了全程的(5/8)．照这样的速度，还要几小时可以到达乙港？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(5/8) / 4.5</gadget>
<output>0.138889</output>

<gadget id="calculator">1 / 0.138889</gadget>
<output>7.199994</output>

<gadget id="calculator">7.199994 - 4.5</gadget>
<output>2.699994</output>

<result>2.699994</result>