How many halves are in 3 1/4

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

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?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2