Problema Solution
Jack usually mows his lawn in 5 hours. Jane can mow the same yard in 10 hours. Derek can mow the same yard in Jack's time cut in half and Jane's time cut in half and added together. How long will it take Derek to mow the lawn?
Answer provided by our tutors
Jack= 5
Jane= 10
Derek= 5/2 +10/2 = 2.5 +5= 7.5 hours.
so, Derek will take 7.5 hours.