Question

除3时外,3时多少分,时针与分针的夹角也是90度.

Answer 1

(3*5+90*(60/360))/(1-5/60)

=(15+90/6)/(1-1/12)

=(15+15)/(11/12)

=30/(11/12)

=30*(12/11)

=360/11

=32又(8/11)分

除3时外,3时32又(8/11)分,时针与分针的夹角也是90度.