(1) Let the speed of B be V, then the speed of A is 2v-30. A It takes (35-5) minutes to get from A to B..

So (35-5)×(2v-30)=35v gives: v=36 (m/min).

So the speed of A is 42 meters per minute.

The distance between a and b is 42× 30 = 1260m.