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英文数学题,请大家帮忙,谢谢!
arollercoastergoesdownthefirstgradeeighttimesfasterthanitgoesuptheotherside.ifshedist...
a roller coaster goes down the first grade eight times faster than it goes up the other side . if she distance down the hill is 100 feet more than the distance up the hill and if it takes 70 seconds to go up and 10 seconds to go down , what is the speed in feet per second of the roller coaster when it goes up the hill and when it comes down the hill?请写步骤!谢谢
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过山车向下速度是它上升速度的八倍。如果她下山距离比上山距离多100英尺,如果需要70秒上去10秒下去,过山车上山和下山的速度分别是多少英尺每秒?
D=8U
10D-70U=100
D-8U=0
U=10
D=80
上山速度是10fps,下山速度是80ftp.
D=8U
10D-70U=100
D-8U=0
U=10
D=80
上山速度是10fps,下山速度是80ftp.
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什么是D,什么是U?
追答
D是down speed下山速度
U是上山速度
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