The bill for a dinner was $80 including tax and tip one of the dinners had a coupon for $25 toward the dinner for five dinners then split the remaining bill equally how much did each Dinner have to pay

This size running track is usually called a 400 meter track. however if a person ran as close to the inside as possible on the track they would run less than 400 meters in one lap. how far away from the inside border would someone have to run to make one lap equal exactly 400 meters