Two cars start from the same point on flat ground. The first car drives off directly north at 25 m/s. Two seconds later the second car drives off directly east at 20 m/s. After how many seconds are they 1km apart?

what the question so we can you out

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b