Math Problem : G.20 Bring all poles to one point

The pole stands every 5 m between 2 points A and B which are 50 m away.

I am at A point now thinking that all poles would be brought together to A point.
Whenever I collect one pole, I return to A point.

Find the distance where I will walk by the time I bring all poles together to A point.

Moreover, when I walk 280 m to collect pole in order from the place near A, find the number of the poles which can be collected.

Noted that the pole stands on two points of A and B as well.

Answer

550 m
8 poles