A and B travel from A to B at the same time in the same direction. When A travels (2/5) of the whole journey, B travels (1/3) of the whole journey. It takes 5 hours for A to travel to B. How many hours does it take for B?
甲乙二人同时从A到B，同向而行，当甲行全程的(2/5)时，乙行全程的(1/3)，甲到B要行5小时，乙要多少小时．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / (1/3)</gadget>
<output>6</output>

<result>6</result>