16 Oct '06 06:15

Two cyclists (call them A and B) are on the same road, 60 km apart facing each other.

At the same moment they ride off towards each other, A at 10 km/hr and B at 20 km/hr.

A fly sits on B's nose and at the moment that he starts cycling, he flies off in the same direction (i.e. towards A) at 30 km/hr.

As soon as the fly reaches A, he turns around (again instantaneously) and flies back towards B. As soon as he reaches B he turns around again and flies back towards A, and so on until the two riders meet.

Question: What distance did the fly travel?

At the same moment they ride off towards each other, A at 10 km/hr and B at 20 km/hr.

A fly sits on B's nose and at the moment that he starts cycling, he flies off in the same direction (i.e. towards A) at 30 km/hr.

As soon as the fly reaches A, he turns around (again instantaneously) and flies back towards B. As soon as he reaches B he turns around again and flies back towards A, and so on until the two riders meet.

Question: What distance did the fly travel?