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Mamont248 [21]
3 years ago
5

Find MN please help me

Mathematics
1 answer:
saveliy_v [14]3 years ago
4 0
(2x-16)+(x-9) = 11

3x-25 = 11

3x = 11+25
3x = 36

36 / 3 = 12 = X

m to n = x-9

12-9 = 3

The distance between M and N is 3


Hope this helps! :)
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Answer:

<em>Roberto's speed in still water is 6 miles/hour and the river speed is 2 miles/hour</em>

Step-by-step explanation:

<u>Relative Speed</u>

When a body is moving at a constant speed v, the distance traveled in a time t is:

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When Roberto rows downstream, his speed in still water is added to the speed of the water, making it easier to travel the required distance.

When Roberto rows upstream, his speed in still water is affected by the speed of the water, both are subtracted and the required distance is covered in more time.

Let's call

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20=(x+y)*2.5

Rearranging, we find the downstream equation:

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20=(x-y)*5

Rearranging, we find the upstream equation:

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10x=60

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x=60/10=6

Dividing [2] by 5:

x-y=4

Solving for y

y=x-4=6-4=2

Thus, Roberto's speed in still water is 6 miles/hour and the river speed is 2 miles/hour

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