System A has two processors. Program X takes $60$ seconds to execute on one of the processors. Program Y takes $60$ seconds to execute in parallel on the other processor. System B has a single processor that can execute only one program at a time. Program X takes $36$ seconds to execute on this processor. Program Y takes $36$ seconds to execute on this processor. Which system would you pick if you cared about overall system throughput for a workload that is a mix of programs X and Y$?$ How many programs would each system complete in one hour? $(15$ points$)$