Uncle Wang walked 310 meters in 2 minutes by bicycle, how many meters can he walk in half an hour?
王叔叔骑自行车2分钟走了310米，半小时能走多少米？
<gadget id="calculator">310 / 2</gadget>
<output>155</output>

<gadget id="calculator">155 * 30</gadget>
<output>4_650</output>

<result>4_650</result>