3 hairpins of equal length connected together are as long as 4 pins of equal length connected together. If each pin is 2.4 cm long, how many cm is each bobby pin?
3支等长的发夹接起来和4个等长的大头针接起来一样长．如果每个大头针长2.4厘米，每支发夹长多少厘米？
<gadget id="calculator">2.4 * 4</gadget>
<output>9.6</output>

<gadget id="calculator">9.6 / 3</gadget>
<output>3.2</output>

<result>3.2</result>