Xiao Wang was running back and forth on a small hillside. First, he ran uphill from the bottom of the mountain at 200 meters per minute. Go down the mountain and run 200 meters per minute, find Xiao Wang's average speed.
小王在一个小山坡上来回运动，先从山下跑上山，每分钟跑200米，再从原路下山，每分钟跑240米，又从原路上山，每分钟跑150米，再从原路下山，每分钟跑200米，求小王的平均速度．
<gadget id="calculator">1 / 200</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">1 / 240</gadget>
<output>1/240 = around 0.004167</output>

<gadget id="calculator">1 / 150</gadget>
<output>1/150 = around 0.006667</output>

<gadget id="calculator">(1/200) + (1/240) + (1/150) + (1/200)</gadget>
<output>1/48 = around 0.020833</output>

<gadget id="calculator">4 / (1/48)</gadget>
<output>192</output>

<result>192</result>