Cars A and B leave opposite places at the same time from places A and B, and meet each other in 3 hours. If it takes 5 hours for car A to travel from point A to point B, how many hours will it take for car B to travel from point B to point A?
甲、乙两车同时从A、B两地相对开出，3小时相遇．如果甲车从A地到B地要行5小时，那么乙车从B地到A地要行多少小时？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * 3</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / (2/5)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>