<span>Yes, the board is long enough. The board is 357 cm long and Suzanna only needs 350 cm length of the board to meet the requirement of 3.5m. </span>
1) 21 books * 17cm = 357 cm is the length of the board. 2) 1 meter = 100 cm 3.5 m * 100cm/1m = 350 cm require length of the board.