Xiaohua walks to school every day. He walks 70 meters per minute and takes 11 minutes to reach school. If mom rides a bicycle to send him, it only takes 3.5 minutes, how fast is mom riding the bicycle?
小华每天步行上学，他每分钟走70米，需要11分钟到达学校．如果妈妈骑自行车送他，只需要3.5分钟，妈妈骑自行车的速度是多少？
<gadget id="calculator">11 * 70</gadget>
<output>770</output>

<gadget id="calculator">770 / 3.5</gadget>
<output>220</output>

<result>220</result>