問題詳情
9.( ) 山路長15公里，已知刀鋒寶貝下山每小時的速率比上山快2公里，且上、下山來回一趟共需8小時。有關刀鋒寶貝上山和下山的速率下列的敘述何者正確？
(A)上山速率為每小時3公里
(B)上山速率為每小時5公里
(C) 下山速率為每小時2公里
(D)下山速率為每小時3公里
(A)上山速率為每小時3公里
(B)上山速率為每小時5公里
(C) 下山速率為每小時2公里
(D)下山速率為每小時3公里
參考答案
無參考答案
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