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27. Approximately what is the length of the rope for the kite sail, in order to pull the ship at an angle of 45° and be at a vertical height of 150 m, as shown in the diagram opposite?  (A)173 m (B)212 m (C)285 m (D)300 m

28. Helen has just got a new bike. It has a speedometer which sits on the handlebar. The speedometer can tell Helen the distance she travels and her average speed for a trip.  On one trip, Helen rode 4 km in the first 10 minutes and then 2 km in the next 5 minutes. Which one of the following statements is correct? (A)Helen’s average speed was greater in the first 10 minutes than in the next 5 minutes. (B)Helen’s average speed was the same in the first 10 minutes and in the next 5 minutes. (C)Helen’s average speed was less in the first 10 minutes than in the next 5 minutes. (D)Helen’s average speed was less in the first 10 minutes than in the next 5 minutes.

29. A、B 兩人一同遊玩猜數字遊戲，右表為兩人的對弈過程: 若B猜的數字中沒有重複、數字只有 1~9。 A B 那麼:A 的數字應該是? (A)4813(B)4381  (C)4138 (D)4183 

30. 如右圖，已知ABCD、EFGC、JIHG四邊形為正方形、 =5， 試求: ADEHG五邊形面積? (A)65 (B)67 (C)73 (D)78

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