The distance a body falls from rest varies directly as the square of the time the body is falling. if a body falls 81 ft. in 3 seconds, how far will it fall in 7 seconds?

Helll ! 1,400 tons of wheat of two different varieties was delivered to the silo. when processing one variety, there was 2% of waste and 3% during the processing of the second variety of wheat. after the processing, the amount of remaining wheat was 1,364 tons. how many tons of each variety of wheat was delivered to the silo?