Gmat DS 求解If the length of Wanda's telephone call was rounde

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Gmat DS 求解
If the length of Wanda's telephone call was rounded up to the nearest whole minute by her telephone company, then Wanda was charged for how many minutes for her telephone call?
　　(1) The total charge for Wanda's telephone call was $6.50.
　　(2) Wanda was charged $0.50 more for the first minute of the telephone call than for each minute after the first.
A.Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B.Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C.BOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D.EACH statement ALONE is sufficient.
E.Statements (1) and (2) TOGETHER are NOT sufficient.
我不理解题目导致做不来,求讲解啊~

我先给你翻译一遍题目：如果W的电话时长是以她最接近的整数分钟计算的话,那么W所花的钱打了多少分钟?1.总共的费用是6.5刀2.第一分钟的钱比后面的若干分钟多0.5刀（后面的若干分钟都是x,第一分钟是x+0.5）
这样你看懂了题以后,1单独显然不能成立,2单独更不能成立
1和2一起的话,设n分钟那么就是nx+0.5=6.5同样不能推出到底多少分钟,因为有两个未知数
所以选E
你看一下答案是不是这样

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