A moving walkway at an airport has a speed v, and a length L. A woman stands on the walkway as it moves from one end to the other, while a man in a hurry to reach his flight walks on the walkway with a speed of v2 relative to the moving walkway. (Use any variable or symbol stated above as necessary.) (a) How long does it take the woman to travel the distance L? (b) How long does it take the man to travel this distance