The distance between A and B is 60 kilometers. A bicycle and a motorcycle drive from A to B at the same time. The motorcycle arrives 4 hours earlier than the bicycle. It is known that the speed of the motorcycle is three times that of the bicycle. What is the speed of the motorcycle?
甲乙两地相距60公里，自行车和摩托车同时从甲地驶向乙地．摩托车比自行车早到4小时，已知摩托车的速度是自行车的3倍，则摩托车的速度是多少．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<result>30</result>