Unexpectedly, the rain from the Dragon King can only extinguish ordinary fires, but it cannot extinguish the real fire of samadhi. The rain is like adding fuel to the fire, and it burns hotter and hotter. As a last resort, Bajie borrowed Wukong's somersault cloud, and went to the south to ask the Bodhisattva to rescue him. When Red Boy learned that Bajie was going south, he expected that he would ask Guanyin for help, so he rushed ahead of him and turned into a "false Guanyin Bodhisattva" to deceive he. Somersault cloud speed is 200 kilometers per hour, and Honghaier's fire cloud speed is 250 kilometers per hour. 15 minutes after Bajie set off, Honghaier set out to catch up. He asked how long it would take Honghaier to fly to intercept Bajie?
哪知龙王雨水只能灭凡火，却灭不了三昧真火，降雨反似火上浇油，越烧越灼，烧得大圣一身烟火，魂飞魄散，一时间不得起身．不得已，八戒借了悟空的筋斗云，便要去南方请菩萨搭救，红孩儿得知八戒南去，料他必向观音求助，便要赶在他前面，化身为「假观音菩萨」欺骗他．筋斗云时速200公里，红孩儿的火云时速250公里，八戒出发后15分钟红孩儿便出发追赶，问红孩儿要飞多久才能拦截到八戒？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">250 - 200</gadget>
<output>50</output>

<gadget id="calculator">(1/4) / 50</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">200 * (1/200)</gadget>
<output>1</output>

<result>1</result>