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° turn by the side of the wall. A
fly flying at a constant speed of 100 km/h, starts from
the wall towards the car at an instant when the car is
20 km away, flies until it reaches the glasspane of the
car and returns to the wall at the same speed. It continues
to fly between the car and the wall till the car makes the
90° turn. (a) What is the total distance the fly has
travelled during this period ? (6) How many trips has it
made between the car and the wall ?
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