A seagull can fly at a speed of 9.3 m/s in still air.

a) Suppose it takes the bird 19.9 min to travel 5.94 km over the ground when flying directly into the wind (the velocity of the air over the ground is opposite in direction to the velocity of the bird through the air). What is the speed of the air over the ground, in m/s?

b) If the bird turns around and flies with the wind, then how long (in minutes) will it take for the bird to move 5.94 km over the ground?