Pratap puri rowed 18 miles down a river in 2 hours, but the return trip took him 4 1/2 hours. Find the rate pratap can row in still water and find the rate of the current. Let x= rate Pratap can row in still water and y= rate of current

rotated. i took the test

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answer: i'm not sure

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-3

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a drawing really does here:

so i draw the horizontal line y=2 and the vertical line x=-2 at this intersection i put b (this is where my right angle is going to be).   so point b is at (-2,2).   point a is 5 units long and is also on y=2 so this point has to be (3,2) or (-7,2) -doesn't matter i will go with (3,2).

now we know c is at (-2,y) we don't know the y yet bet we know that c is on x=-2.

we have the area of the triangle is .5bh=12.5

we know the base length is 5 (ab)

we have the height is (2-y) if you look at your

plug in

.5(5)(2-y)=12.5

solve for y to get the y-coordinate for c

2.5(2-y)=12.5

divide both sides by 2.5 giving:

2-y=5

now subtract 2 on both sides

-y=3

y=-3

you probably already have the answer but anyways it's b. 15.0

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