As the answer requires least number of machine hours required to produce 30 pieces of P and 25 pieces of Q
So, we'll go by which m/c takes less time to produce product p & product Q
M/C M2 consumes less time to produce product P
M/C M1 & M2 both consumes same time to produce product Q
Time taken by M2 to produce 30 pieces of P = 30 * 8 = 240 min
Time taken by M1 or M2 to produce 25 pieces of Q = 25 * 6 = 150 min
∴ Least number of machine hours required to produce 30 pieces of P and 25 pieces of Q is (240 + 150)min = 390 min = 6hrs and 30min