Two ships, A and B, depart from two ports 841 km apart at the same time, and meet after 5.8 hours. It is known that a ship travels 72 km per hour, how many kilometers per hour does B ship travel? (Solution of column equation)
甲乙两艘轮船同时从相距841km的两港相向开出，经过5.8小时两船相遇．已知甲艘轮船每小时行驶72km，乙艘轮船每小时行驶多少千米？(列方程解)
<gadget id="calculator">72 * 5.8</gadget>
<output>417.6</output>

<gadget id="calculator">841 - 417.6</gadget>
<output>423.4</output>

<gadget id="calculator">423.4 / 5.8</gadget>
<output>73</output>

<result>73</result>