If a pitcher throws a 85 mph fastball, how much time elapses from when the ball leaves the pitcher's hand until the ball reaches the batter

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What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?