標題:
Very Urgent
發問:
Kenny and Nancy start at the same position and walk in the directions of S58E and S32W respectively.Kenny walks at 8km/h and Nancy walks at 6km/h. Find their distance apart after 3 hours and the compass bearing of Nancy from Kenny. 更新: This is not the answer! Please help me!
最佳解答:
Let the position of the starting point be O. Let the positions of Nancy and Kenny be N and K, respectively. (You should notice that the angle between S58E and S32W is 90°) Since ∠NOK = 90°, then NK2 = ON2 + OK2 = (8*3)2 + (6*3)2 = 900 NK = 30 Their distance apart after 3 hours are 30km. tan ∠ONK = (6*3) / (8*3) ∠ONK = 37° Since 37° > 32°, then 90°- ( 37° - 32°) = 85° the compass bearing of Nancy from Kenny is S85°W
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