In a given situation where workers are of the same rate, the number of workers is directly proportional
to the amount of work done and inversely proportional to the time of work. It takes 15 men, working
8 hours a day for 20 days, to produce 3 sets of furniture. If the men work at the same rate, how many
days will it take 10 men to produce 6 sets of furniture if they work 6 hours a day?