An airplane is flying away from a lookout tower at a constant height of 5 km above the ground. If the distance s between the airplane and the lookout tower is increasing at a rate of 350 km/hour when s=8 km, what is the horizontal speed of the plane?

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?