The time will be 48 because 5*4=20, so 12*4=48 now william reaches faster 20 miles that 20-5=15 5*3=15 so 12*3=36 therefore william reaches school 12 minutes faster.
Pentagon has 5 angles. 360/5= 72 degrees 16-gon has 16 angles. 360/16= 22.5 degrees dodecagon has 12 angles. 360/12= 30 degrees The measure of the exterior angle of any regular polygon is 360 divides by the number of sides the polygon has.
