Answer: They work for 2.5 hours to gift wrap 65 boxes.
Step-by-step explanation:
Since we have given that
Number of boxes Jack can wrap = 28
Time taken by him = 2 hours
Number of boxes Walter can wrap = 36
Time taken by him = 3 hours
Work done by Jack in 1 hour is given by
Work done by Walter in 1 hour is given by
So, Work done by both Jack and Walter in 1 hour is given by
L.C.M. of is
Number of units done by Jack is given by
Number of units done by Walter is given by
So, Let the number of hours be 't' .
So, They work for 2.5 hours to gift wrap 65 boxes.