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RE: Puzzle Contest #10 - First to get all the correct answers wins 5 SBD, all attempts will receive an upvote.
Answer 1: c
Answer 2: 1
Answer 3: a 21, b 111, c 17, d 75
Answer 4: a Mike wins 100m time= 8.57s;
b Mike wins 50m time too. Time: 4.73s.