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5

Step-by-step explanation:

perimiter of rectangle is 3+7+7+3 = 20

square x+x+x+x=20

4x=20

x=20/4

x=5

5

Step-by-step explanation:

The perimeter of the rectangle is 20 because 7x2+3x2=20

And 20/4(sides of a square) =5

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b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.