Two brothers take a taxi from point A to point B. When they reach the midpoint of the two places, they meet a classmate. In order to save money, the three of them share a taxi to point B. The driver charges 10 yuan. If calculated according to the distance traveled by each person, how much should the student who got on the bus later pay?
兄弟两人乘一辆出租车从A地到B地，行驶到两地中点时，遇到一位同学，为了省钱，3人合乘到B地，司机收费10元．如果按每人乘车的路程计算，后上车的这位同学应付多少元．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<result>2</result>