What did the letters RPG refer to?

Danny went for a long bike ride he covered at least forty miles

What is edwin's character inferences in dust by charles grayson? ?

Ead this sentence from the evolution of useful things.the underlined phrases indicateaaking waterproof sandpaper would allow wet sanding,which in turn would cut down on dust, and thus be a greatmprovementpassing of timea directional change of positiona cause-and-effect relationshipsequence of events.save and exitmark this and retur