Riders A and B ride motorcycles from places A and B at the same elbow, and run toward each other. After 3 hours, they meet at a place 12 kilometers away from the midpoint to B. Rider A travels 45 kilometers per hour, and Rider B How many kilometers per hour?
甲、乙两车手骑摩托车从A、B两地同肘出发，相向而行，经过3小时在距中点偏向B地12千米的地方相遇，甲车手每小时行45千米，乙车手每小时行多少千米？
<gadget id="calculator">45 * 3</gadget>
<output>135</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">135 - 24</gadget>
<output>111</output>

<gadget id="calculator">111 / 3</gadget>
<output>37</output>

<result>37</result>