问题描述：
A graded section of road is 100 metres long and rises 9 metres.
What is the grade (slop) of that section of road?
(a) 0.111
(b) 0.09
(c) 0.9
(d) 1.9 求达人详解
What is the grade (slop) of that section of road?
(a) 0.111
(b) 0.09
(c) 0.9
(d) 1.9 求达人详解
问题解答：
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