Xiaoying walked back and forth 2 times along a 50-meter straight road, and walked a total of 400 steps. How many meters is each step on average?
小英沿着一条50米的直道往返走了2个来回，共走了400步，平均每步是多少米．
<gadget id="calculator">2 / 400</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">50 * 2 * (1/200)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>