An airplane takes 4 hours to travel a distance of 3200 miles with the wind. The return trip takes 5 hours against the wind. Find the speed of the plane in still air and the speed of the wind. please include work and how to get the answer

A. the probability that a product is defective is 0.1. what is the probability that there will be 1 or less defective products out of the next 8 produced products b. the expected number of imperfections in the coating nylon for parachutes is 6 per 100 yards. what is the probability of finding 12 or fewer imperfections in 260 yards c. in a lot of 54 products there are 9 defective products. calculate the probability that not more than 1 is defective from a random sample of 17 products.