What I think is probably wrong: when T = 0, m coincides with 0, and n coincides with B. At this time, MP=3.2-2= 1.5, and the MP value is unchanged from the meaning of the question.

When t is greater than 0, MP =1.5 = v1* t+op = v1* t+(bo-bn-pn) = v1* t+5-v2 * t-(3.5- T=0 means (V 1-0.5V2)*T=0. When t is greater than 0, V 1=0.5V2, so the ratio of V 1/V2=0.5 remains unchanged. I have been thinking correctly for nearly half an hour. I don't know what to do in the junior high school entrance examination this year. . . . . Hope to adopt