The map scale is 1:1000000. So that 1 cm on the map corresponds to 1,000,000 cm in reality.
Multiply the map distance by the scale factor: 3.5 cm × 1,000,000 cm/1 cm = 3,500,000 cm.
Convert the actual distance from centimeters to kilometers: 3,500,000 cm ÷ 100,000 cm/km = 35 km.
So the actual distance between the two cities is 35 km.