Two naughty children walk in the opposite direction of the escalator, from one end of the escalator to the other end, the boy walks for 100 seconds, and the girl walks for 300 seconds. It is known that when the elevator is stationary, the boy walks 3 meters per second, and the girl walks 2 meters per second. What is the length of the escalator in meters?
两个顽皮的孩子逆着自动扶梯行驶的方向行走，从扶梯的一端到达另一端，男孩走了100秒，女孩走了300秒．已知在电梯静止时，男孩每秒走3米，女孩每秒走2米．则该自动扶梯长多少米．
<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">1 / 300</gadget>
<output>1/300 = around 0.003333</output>

<gadget id="calculator">(1/100) - (1/300)</gadget>
<output>1/150 = around 0.006667</output>

<gadget id="calculator">1 / (1/150)</gadget>
<output>150</output>

<result>150</result>