Problema Solution
Jack usually mows his lawn in 3 hours. Marilyn can mow the same yard in 7 hours. How much time would it take for them to mow the lawn together?
Answer provided by our tutors
so efficiency of jack is 100/3 i.e 33.33%
efficiciency of marilyn 100/7 i.e 14.3
if together time taken 100/(33.33+14.3)=1.73 hr