选择题：一段路程分为上坡、平路、下坡三段，路程长之比依次是1 ： 2 : 3。小龙走各段路程所用时 间之比依次是4:5:6。已知他上坡时速度为每小时3千米，路程全...

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一段路程分为上坡、平路、下坡三段，路程长之比依次是1 ： 2 : 3。小龙走各段路程所用时 间之比依次是4:5:6。已知他上坡时速度为每小时3千米，路程全长是50千米，小龙走 完全程用多少小时？（ ） A. 10 5/12 B. 12 C. 14 1/12 D. 10

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