first you need to find the area of the rectangle that is made by the fence to find the sq. ft. that Rashid needs to paint.
A=length *width
A=6*25
A=150 sq. ft.
each 2 is 10 mins so divide by two
75
times 10 to get in mins
total time 750 mins
now subtract 60 until you cant get a positive number
12 hrs and 30 mins