The distance between A and B is 252km, the motorcycle travels 30km per hour, and the speed ratio of the car and the motorcycle is 5:2. The two cars departed opposite each other from the two cities at the same time, and how many hours later did they meet on the way?
A，B两地相距252km，摩托车每小时行30km，汽车与摩托车的速度比是5：2．两车同时从两城相对开出，几小时后途中相遇？
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">30 * (5/2)</gadget>
<output>75</output>

<gadget id="calculator">30 + 75</gadget>
<output>105</output>

<gadget id="calculator">252 / 105</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>