5.4 cm on map represents 270 m
5.4 cm on map represents 27000 cm
1 cm on map represents 27000/5.4 = 5000 cm
= 50m
25 Planes can take off. Divide 60 (minutes) by 12 and it should give you 5. Take that five and multiply it by the number of hours they are asking for (5). 5*5=25.
Use the equation for the area of a triangle:

where A = area, h = height of the triangle, and b = base of the triangle.
You know that h=18m and A=99

. Plug those values into the equation and solve for b, the base.
The base is 11m long.
The lowest common denominator among these would be 3