The distance between A and B is 1050 kilometers. A regular express train and an express train depart from the two places in opposite directions. They meet at 3.5 hours. The speed ratio of the regular express train and the express train is 2:3, and the speed of the express train is How many kilometers per hour? (solution with equation)
甲、乙两地相距1050千米，一列普快列车和一列特快列车分别从两地相向开出，经过3.5时相遇，普快列车和特快列车的速度比是2：3，特快列车的速度是每小时多少千米？(用方程解答)
<gadget id="calculator">2 * 3.5</gadget>
<output>7</output>

<gadget id="calculator">3 * 3.5</gadget>
<output>10.5</output>

<gadget id="calculator">7 + 10.5</gadget>
<output>17.5</output>

<gadget id="calculator">1_050 / 17.5</gadget>
<output>60</output>

<gadget id="calculator">3 * 60</gadget>
<output>180</output>

<result>180</result>