A man fell asleep studying for his math exam. He woke up at 9:30 p. m. If he slept for 3 hours and 50 minutes, what time did he fall asleep? A. 6:20 p. m.
B. 6:05 p. m.
C. 5:40 p. m.
D. 5:20 p. m.​

C.   5:40 p.m.

Step-by-step explanation:

seems like d

step-by-step explanation:

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