If the unit price of pen and notebook is X yuan and Y yuan respectively, we get: 60 *(X2Y)= 50 *(X3Y):X = 3y, so 60 * (X2y) = 50 * (X3y) =100X = 300Y.

Let the speed of armor be vkm/h, because 20 minutes is equal to one third of 1 hour, so according to the meaning of the question, (80-v *1)/v+1/3 = 80/1.5v is multiplied by1at the same time.

So the speeds of A and B are 40km/h and 60km/h respectively.