Ernie can plow a field alone in hour. It takes Sid five hour to plow the same field alone. If they work together how long will it take them to flow the same field?
Answer (1)
Answer:Ernie's rate: 1/1 = 1 field per hour.Sid's rate: 1/5 field per hour. 1 + 1/5= 1/1 + 1/5= 5/5 + 1/5Combined rate = 6/5 field per hour.Time = 1/1 ÷ 6/5= 5/6 hours or 50 minutes.
