There is a clock in the living room. The hour hand is 15 centimeters long. How many centimeters can its tip travel in a day?
客厅里有一面钟，时针长15厘米，它的尖端一天能走多少厘米？
<gadget id="calculator">3.14 * 15 * 2</gadget>
<output>94.2</output>

<gadget id="calculator">94.2 * 2</gadget>
<output>188.4</output>

<result>188.4</result>