Question

Can u please explain how to do this?

Answer 1

Scale given is 1cm = 35km
When measuring the distance between the two cities on the map gives you 8cm.
Therefore when you want to find the actual distance, you multiply the distance measured on the map with the scale.

Like this;

8 × 35 = 280 km
Answer should be (B)

Answer 2

B is the correct answer. 
8 x 35 = 280