Bus No. 2 travels 10 kilometers from the station to the zoo, and goes back and forth 5 times a day. How many kilometers does it travel in total in one day?
2路公交车从车站到动物园要行驶10千米，每天往返5次，一天共行多少千米？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<result>100</result>