SOLUTION: Four men working at the rate of 8 hours a day can build a house in 5 days.How long would 7 men working for 3 hours a day take to build the same house
The entire job is 4*8*5 = 160 man-hours.
7 men working 3 hours a day will complete the job in = 7.619 days = 7 days and 1.857 hours, under given conditions.