Two ships A and B sailed out of the dock at the same time from two ports 210 kilometers apart, and met after (7/3) hours. It is known that ship A travels (45/2) kilometers per hour, and how many kilometers does ship B travel per hour? ?
甲乙两艘轮船从相距210千米的两港同时相向驶出码头，经过(7/3)小时相遇，已知甲船每小时航行(45/2)千米，乙船每小时航行多少千米？
<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">210 / (7/3)</gadget>
<output>90</output>

<gadget id="calculator">45 / 2</gadget>
<output>45/2 = around 22.5</output>

<gadget id="calculator">90 - (45/2)</gadget>
<output>135/2 = around 67.5</output>

<result>135/2 = around 67.5</result>