Two cars painted yellow and red are racing against each other on a track of length 4000 meters.
The race ends in a tie as both cars finish the race in exactly the same time. However at first
when the race starts the yellow car moves 50% faster than the red car. The red car then
quickened its pace and for the remaining distance moved 50% faster than the yellow car. When
the red car quickened its pace what distance had it already covered?