SOLUTION: On a road map of Pennsylvania the distance from Philadelphia to Washington D.C.is 6.8 centimeters. The map scale is 2 cm :40 mi . What Is the actual distance between the cities

Algebra ->  Coordinate-system -> SOLUTION: On a road map of Pennsylvania the distance from Philadelphia to Washington D.C.is 6.8 centimeters. The map scale is 2 cm :40 mi . What Is the actual distance between the cities       Log On


   

Question 1007645: On a road map of Pennsylvania the distance from Philadelphia to Washington D.C.is 6.8 centimeters. The map scale is 2 cm :40 mi . What Is the actual distance between the cities
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
We set up a proportion
2+%2F+40+=+6.8+%2F+x
We can cross-multiply and get
2x = 272
x = 136 mi