On a straight road, a tractor at a speed of 40 km / h and a motorcycle at a speed of 60 km / h travel in one direction

On a straight road, a tractor at a speed of 40 km / h and a motorcycle at a speed of 60 km / h travel in one direction,
a) Can the distance between them decrease with time?
b) Can the distance between them increase over time?

a) The distance between them will decrease over time if the rider catches up with the factor; b) The distance increases with time if the motorcyclist rides in front of the tractor.

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