A country baker sent off his boy with a message to the butcher in the
next village, and at the same time the butcher sent his boy to the baker.
One ran faster than the other, and they were seen to pass at a spot 720
yards from the baker's shop. Each stopped ten minutes at his destination
and then started on the return journey, when it was found that they
passed each other at a spot 400 yards from the butcher's. How far apart
are the two tradesmen's shops? Of course each boy went at a uniform pace
throughout.