The wings on a stonefly do not flap, and thus the insect cannot fly. However, when the insect is on a water surface, it can sail across the surface by lifting its wings into a breeze. Suppose that you time stoneflies as they move at constant speed along a straight path of a certain length. On average, the trips each take 7.1 s with the wings set as sails and 25.0 s with the wings tucked in.
(a) What is the ratio of the sailing speed vs to the nonsailing speed vns?
(b) In terms of vs, what is the difference in the times the insects take to travel the first 2.0 m along the path with and without sailing?