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denis-greek [22]
11 months ago
15

a motorboat travels 456 km in 8 hours going upstream and 783 km in 9 hours going downstream. what is the rate of the boat in sti

ll water and what is the rate of current?
Mathematics
1 answer:
Galina-37 [17]11 months ago
4 0
\begin{gathered} \text{Let;s assume the sp}e\text{d of boat in still water is x.} \\ And\text{ the spe}ed\text{ of stream is y.} \\ For\text{ upstream,} \\ (x-y)\times8=456 \\ x-y=57\ldots(1)_{} \\ (x+y)\times9=783 \\ x+y=87 \\ x=87-y\ldots(2) \\ \text{Now, substitute the value of x in the equation (1).} \\ 87-y-y=57 \\ -2y=57-87 \\ 2y=30 \\ y=15\text{ km/hours (rate of current)} \\ \text{Substitute the value of y in the equation (2).} \\ x=87-15 \\ x=72\text{ km/hours (boat in still water)} \end{gathered}

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IceJOKER [234]

Answer:

0

Step-by-step explanation:

if you slightly change the equation to better fit standard form (without actually changing its meaning) you get

y = 0x + 5

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Also, a shortcut:

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2 years ago
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nikklg [1K]
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4 0
3 years ago
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If you don’t help me your a criminal
STALIN [3.7K]

Answer:

take angle U as reference angle

using sine rule

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Step-by-step explanation:

6 0
3 years ago
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lukranit [14]

Answer:

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Step-by-step explanation:

Given :

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The estimated standard error can be obtained using the relation :

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S.E = 6

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7 0
2 years ago
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