C\&A makes two types of products using four machines from 9 a.m. to 5 p.m. each day. Product A visits machines 1, 2, and 4. Product B only visits machines 1 and 3 . The capacity is 0.4 unit per minute at machine 1, 0.12 unit per minute at machine 2, 0.2 unit per minute at machine 3 , and 0.3 unit per minute at machine 4 . The demand per day is 10 units for Product A and 40 units for Product B. What is the (actual) flow rate of product B? (in units per day, keep the integer number, no decimal) Asnwer