The base of a triangular playground is 400 meters, which is 50 meters more than the height. Calculated on the average that each hectare can receive up to 1,500 people at the same time, how many tourists can this playground receive at the same time?
一块三角形游乐场的底是400米，比高多50米．按平均每公顷最多可同时接待1500人计算，这个游乐场最多可同时接待多少游客？
<gadget id="calculator">400 - 50</gadget>
<output>350</output>

<gadget id="calculator">350 / 2 / 10_000</gadget>
<output>7/400 = around 0.0175</output>

<gadget id="calculator">1_500 * 400 * (7/400)</gadget>
<output>10_500</output>

<result>10_500</result>