男性老年人小便红色:英文数学题解答(答案:A: 11mi/hr B: 3 mi/hr)
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A is riding a bicycle along a road and B is walking along the same road. They are 2.8 miles apart, and will be together in 12 minutes if they are travelling in opposite directions; in 21 minutes if they are travelling in the same direction. What are their respective rates?
solution:
suppose x is the rate of A,y is the rate of B
then
12/60*(x+y)=2.8
21/60*(x-y)=2.8
we have x:11 y:3
AB相距2.8英里,相向而行12分钟相遇,同向21分钟相遇。问他俩的速度。
解:设Va,Vb为A,B速度
(Va+Vb)12/60=2.8
(Va-Vb)21/60=2.8
解得:Va=11,Vb=3
(a+b)*12/60=2.8
(a-b)*21/60=2.8
a=11mile/h, b=3mile/h
A'rates is 11 miles/hour
B'rates is 3 miles/hour
英文数学题解答
悬赏分:5 - 离问题结束还有 14 天 23 小时
A is riding a bicycle along a road and B is walking along the same road. They are 2.8 miles apart, and will be together in 12 minutes if they are travelling in opposite directions; in 21 minutes if they are travelling in the same direction. What are their respective rates?
答案:A: 11mi/hr B: 3 mi/hr
b
英文数学题解答(答案:A: 11mi/hr B: 3 mi/hr)
英文数学题解答(答案:A:11 mi/hr B: 3 mi/hr)
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