Answer:
Q = min[3B; 40L]
Explanation:
This is an example of Leontief production function in which factors of production, in this case B and L, are used in fixed proportion that is determined by the production technology which makes substitutability between factors impossible.
If we assume that 3 ounces of B and 40 minutes of L are always required to produce one unit of espresso represented by Q, the functional form of the production function can be written as follows:
Q = min[3B; 40L].