唐老鸭与米老鼠进行一万米赛跑，米老鼠的速度是每分钟125米，唐老鸭的速度是每分钟100米．唐老鸭手中掌握着一种迫使米老鼠

Mickey Mouse is an Academy Award-winning comic animal cartoon character who has become an icon for The Walt Disney Company.Mickey Mouse was created in 1928 by Walt Disney and Ub Iwerks[1] and voiced by Walt Disney.The Walt Disney Company celebrates his birth as November 18,1928 upon the release of Steamboat Willie.[2] The anthropomorphic mouse has evolved from being simply a character in animated cartoons and comic strips to become one of the most recognizable symbols in the world.
Donald Duck is an animated cartoon and comic-book character from Walt Disney Productions.Donald is a white anthropomorphic duck with yellow-orange bill,legs,and feet.He usually wears a sailor shirt,cap,and a red or black bowtie — but no trousers (except when he goes swimming).Donald's most famous trait is his easily provoked and occasionally explosive temper.
According to Disney canon,Donald's full name is Donald Fauntleroy Duck,probably a reference to his traditional outfit.Donald's birthday is officially recognized as June 9,1934[2],the day his debut film was released,but in The Three Caballeros,his birthday is given as simply "Friday the 13th".In Donald's Happy Birthday (short) gives his birthday as 13 March.

至少须发出13次指令.
唐发出了第1次指令,米倒退的距离就是125*1*10%*1,
唐发出了第2次指令,米倒退的距离就是125*2*10%*1,
唐发出了第N次指令,米倒退的距离就是125*N*10%*1,
N次指令使米倒退N分钟,倒退的总距离就是
125*1*10%*1+125*2*10%*1+……+125*N*10%*1=125*10%*1*(1+2+……+N)=125*10%*1*(N+1)*N/2,
米再跑过这段距离的时间就是[125*10%*1*(N+1)*N/2]/125=10%*1*(N+1)*N/2,
唐跑完1万米需要10000/100=100分,米跑完1万米需要10000/125=80分,唐要获胜,就要使米在100分内无法到达终点,也就是 米正常跑完1万米的时间+倒退的时间+米跑完倒退的距离所需的时间>100,
80+N+[10%*1*(N+1)*N/2]>100,即N^2+20N-400>0,解得N>12.1,或N