What is the formula for finding the perimeter of a space?

What shape is it? the formula is different depending on the shaping

Explanation:

SquareP=4s

RectangleP=2L+2W

Trianglea+b+c

Circle     P=C=2πr=πd

and so on

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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c) both a and b.