Xiao Ming walks 75 meters per minute, and Xiao Fen walks 55 meters per minute. The two start from the school to the Children's Palace at the same time. Xiao Ming arrives 4 minutes earlier than Xiao Fen. How many meters are there from the school to the Children's Palace?
小明每分钟走75米，小芬每分钟走55米，两人同时从学校出发前往少年宫，小明比小芬早4分钟到达，从学校到少年宫有多少米．
<gadget id="calculator">1 / 55</gadget>
<output>1/55 = around 0.018182</output>

<gadget id="calculator">1 / 75</gadget>
<output>1/75 = around 0.013333</output>

<gadget id="calculator">(1/55) - (1/75)</gadget>
<output>4/825 = around 0.004848</output>

<gadget id="calculator">4 / (4/825)</gadget>
<output>825</output>

<result>825</result>