Chairs are made in a process with a single resource. There are two types of chairs. The resource$$s processing time for the first type is $30$ minutes and demand for this type is $2\mathrm{.}3$ chairs per hour. The resource$$s processing time for the second type is $23$ minutes and demand for this type is $2\mathrm{.}8$ chairs per hour. There is $1$ worker at this resource.