单选题A group of hikers is planning a trip that will take them up a mountain using one route and back down using another route. They plan to travel down the mountain at a rate of one and a half times the rate they will use on the way up, but the time each route will take is the same. If they will go up the mountain at a rate of 4 miles per day and it will take them two days, how many miles long is the route down the mountain?A4B6C8D12E16
单选题
A group of hikers is planning a trip that will take them up a mountain using one route and back down using another route. They plan to travel down the mountain at a rate of one and a half times the rate they will use on the way up, but the time each route will take is the same. If they will go up the mountain at a rate of 4 miles per day and it will take them two days, how many miles long is the route down the mountain?
A
4
B
6
C
8
D
12
E
16
参考解析
解析：
下山的速度=1.5×4=6，所以下山的路程=6×2=12miles，故本题选D项。
下山的速度=1.5×4=6，所以下山的路程=6×2=12miles，故本题选D项。
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