The distance between the two places is 800 kilometers. It takes 16 hours for car A to complete the journey, and 10 hours for car B to complete the journey. After 3 hours of departure of car A, car B chases car A. How long will it take for car B to catch up with car A?
两地相距800千米，甲车行完全程需16小时，乙车行完全程需10小时，甲车出发3小时后，乙车去追甲车，问乙车要多久才能追上甲车？
<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) - (1/16)</gadget>
<output>3/80 = around 0.0375</output>

<gadget id="calculator">3 / (3/80)</gadget>
<output>80</output>

<gadget id="calculator">(1/16) * 80</gadget>
<output>5</output>

<result>5</result>