The distance from the zoo to the railway station is 15 kilometers. The No. 3 bus has to drive 5 round trips between two stations every day. How many kilometers does this bus travel every day?
从动物园到火车站的路程是15千米．3路公交车每天要在两站之间开5个来回，这辆公交车每天行驶多少千米？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<result>150</result>