Asked by Hale
Jack and Jill are skating. Jill has a mass of 50 kg, Jack has a mass of 80 kg. At t=0 seconds Jill starts skating across a 50 m diameter rink at a speed of 3 m/s. After 3 seconds Jack skates after her with a speed of 5 m/s. When they meet, Jack scoops up Jill and they glide to the other end of the rink together. At what time t in seconds do they reach the other side of the rink? You can neglect any friction of the ice or drag.