It took 150 seconds to saw a 300cm wooden bar into three pieces, how many seconds would it take to saw it into four pieces?
把300cm的木条锯成三段用了150秒，如果把锯成4段要用多少秒．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">150 / 2</gadget>
<output>75</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">75 * 3</gadget>
<output>225</output>

<result>225</result>