Reasoning
1,000 in Roman numerals.
X = 10
L = 50
C = 100
D = 500
M = 1,000
??
Puzzle 2
I am a 10-letter word.
My 9, 6, 1, 2 is something a swimmer might do.
My 5, 4, 4, 3 is not that hot really.
My 7, 4, 3, 2 is a long piece of wood.
My 7, 6, 8, 5, 10 is a small part of something.
My 3, 4, 1, 10 is a deep affection.
My 7, 6, 8 is something you can eat.
My whole is an old form of transport.