A Sailing Puzzle:

Consider this puzzle:

A river runs straight **from LEFT to RIGHT** at 10 knots (approx 10 kilometres per hour).

The start line is also on the LEFT and the boats sail towards the finish line on the RIGHT
  - When the first race is held, **there is no wind blowing**.
  - When the second race is held, **a constant 10 knot blows** from the LEFT to the RIGHT

Which of the two races described above will be run in the fastest time?

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