How to solve on a road map of pennsylvania, the disatance 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?

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?