A car is moving at a constant speed of 40 km/h along a straight road which heads towards a large vertical wall and makes a sharp `90^0` turn by the side of the wall. A fly flyingat constant speed of 100 km/h, starts from the wall towrds the car t an instant when the car is 20 km away,flies until it reaches the glasspane of the car and returns to teh wll at teh same speed. It continues to fly between the car and teh wall time the car makes the `90^0` turn. a. What is the total distance the fly has travelled during the period?b. How many trips has it made between the car and the wall?

Answer

`[50 km, oo]`