1)w=W1+W2
2)w1R1=V1
w2R2=v2
t1=2πR1/(v1+v2)=2πR1/(w1R1+w2R2)
3)t2=2πR2/(wR2)=2πR2/((w1+w2)R2)=2π/(w1+w2)