Two cars A and B are traveling in the same direction from two places 36 kilometers apart at the same time. After 2.4 hours, A catches up with B. The speed of A car is 60 km/h. Find the speed of B car.
甲、乙两辆汽车同时从相距36千米的两地同向而行，2.4小时后甲追上乙，甲车的速度是60千米/时，求乙车的速度．
<gadget id="calculator">36 / 2.4</gadget>
<output>15</output>

<gadget id="calculator">60 - 15</gadget>
<output>45</output>

<result>45</result>