Question 969896: A boat goes downstream 72 miles in 3 hours, and travels upstream 60 miles in 6 hours.
What is the rate of the river, and what is the boat in still water?
Found 3 solutions by lwsshak3, n2, josgarithmetic:
Answer by lwsshak3(11628)   (Show Source):
You can put this solution on YOUR website! A boat goes downstream 72 miles in 3 hours, and travels upstream 60 miles in 6 hours. What is the rate of the river, and what is the boat in still water?
***
let x=rate of boat in still water
let c= rate of the river
x+c=rate of boat downstream
x-c=rate of boat upstream
travel time*rate=distance
..
3(x+c)=72
6(x-c)=60
..
3x+3c=72
6x-6c=60
..
6x+6c=144
6x-6c=60
add
12x=204
x=17
..
subtract:
12c=84
c=7
rate of boat in still water=17 mph
rate of the river current=7 mph
Answer by n2(91) (Show Source):
You can put this solution on YOUR website! .
A boat goes downstream 72 miles in 3 hours, and travels upstream 60 miles in 6 hours.
What is the rate of the river, and what is the boat in still water?
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Looking at the solution by @lwsshak3 in his post, I see that the logic
on how the solution is constructed in the post by @lwsshak3 is the same
which @mananth uses in his solutions to similar problems.
From this fact, I make my conclusion that they both use the same computer code.
Their logic is not effective, and their way solving, in my view, is wrong way teaching.
Answer by josgarithmetic(39835) (Show Source):
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