Two trains are 1 kilometer apart on a single track railway line. They set off towards one another at 1 meter/second.
1.0 km1.5 km0.5 km2.0 km
A bee sitting on the front of one of the trains sets off and starts to fly along the railway line at 3 meters/second.
When the bee meets the other train it immediately turns around and flies towards the first train and so on . . .
How far does the bee fly?