A restaurant is open 24 hours a day. The manager wants to divide the day into work shifts equal length. The shifts should not be overlap, and all this if duration should be a whole number of hours.

The shifts can be divided into 4 hours, 6 hours, 12 hours, 2 hours, and 1 hour

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.