Sophia spent $7.30 for school supplies . she spent $3.00 for a notebook and$175 for a pen. she also bought 3 large erasers. if eacheraser had the same cost, how much did she spend for each eraser?

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?