Think Zoo is holding a $$3000-$$metre race. A buck, a lion, a giraffe and an elephant take part in the race. If the buck runs $$600$$ metres per minute, and the elephant runs $$250$$ metres per minute, then the buck will finish the race~\uline{~~~~~~~~~~}~minutes earlier than the elephant.\hspace{0pt} 
Overseas Competition->Knowledge Point->Word Problem Modules Overseas Competition->Knowledge Point->Distance Word Problems->Distance Word Problems on Straight Road