$45 ÷ 2=22.5
22.5 + 5 free hours = 27.5 hours total.
You have to divide the amount of money you have by the $2 per hour and then you add the 5 free hours.
We see from the attached, that kite area = product of the diagonals / 2 The diagonals could be 12 by 8 or 6 by 16 or 3 by 32, etc It cannot be narrowed down any further.