A, B, and C walk along the lake, starting from a fixed point on the lake at the same time, A walks clockwise, B and C walk counterclockwise, after A meets B for the first time (5/4) Meet C in 1 minute, and meet B for the second time in (15/4) minutes. It is known that B's speed is (2/3) that of A, and the circumference of the lake is 900 meters. Find C's speed.
甲、乙、丙三人沿着湖边散步，同时从湖边固定点出发，甲按顺时针方向行走，乙和丙按逆时针方向行走，甲第一次遇到乙后(5/4)分钟遇到丙，再过(15/4)分钟第二次遇判乙，已知乙的速度是甲的(2/3)，湖的周长是900米，求丙的速度．
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">5 + (5/4)</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">900 / (25/4)</gadget>
<output>144</output>

<gadget id="calculator">900 / 5</gadget>
<output>180</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">180 * (2/5)</gadget>
<output>72</output>

<gadget id="calculator">180 - 72</gadget>
<output>108</output>

<gadget id="calculator">144 - 108</gadget>
<output>36</output>

<result>36</result>