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balu736 [363]
2 years ago
14

A woman leaves home 7:00am and drives to o new york city 200 miles away.if she average 50 miles per hour,what time will she arri

ves at the city
Mathematics
2 answers:
Wittaler [7]2 years ago
8 0

speed =  \frac{distance}{time}

time =  \frac{distance}{speed}

<h3>speed = 50 miles per hour </h3>

<h3>distance = 200 miles </h3>

time =  \frac{200}{50}

time = 4 \:  \: hours

<h3>if she starts from 7:00 am the she arrives at New York at 11:00 am because takes 4 hours to complete her journey. </h3>

<h3>Have a nice day my friend. </h3>
hammer [34]2 years ago
6 0

Answer:

She gets there at 12:00.

PLEASE MARK AS BRAINLESS!!!!

Step-by-step explanation:

So if it is 200 miles away 50 miles per hour 50 goes into 200 4 times add 4 to 7:00 to get you to 12:00.

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Answer:

Dimensions will be

Length = 7.23 cm

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Step-by-step explanation:

A closed box has length = l cm

width of the box = w cm

height of the box = h cm

Volume of the rectangular box = lwh

504 = lwh

h=\frac{504}{lw}

Sides which involve length and width and height, cost = 3 cents per cm²

Top and bottom of the box costs = 4 cents per cm²

Cost of the sides C_{s}= 3[2(l + w)h] = 6(l + w)h

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Total cost of the box C = 3024\frac{(l+w)}{lw} + 8lw

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To minimize the cost of the sides

\frac{dC}{dl}=3024(-l^{-2}+0)+8w=0

\frac{3024}{l^{2}}=8w

\frac{378}{l^{2}}=w ---------(1)

\frac{dC}{dw}=3024(-w^{-2})+8l=0

\frac{3024}{w^{2}}=8l

\frac{378}{w^{2}}=l

w^{2}=\frac{378}{l}-------(2)

Now place the value of w from equation (1) to equation (2)

(\frac{378}{l^{2}})^{2}=\frac{378}{l}

\frac{(378)^{2} }{l^{4}}=\frac{378}{l}

l³ = 378

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From equation (2)

w^{2}=\frac{378}{7.23}

w^{2}=52.28

w = 7.23 cm

As lwh = 504 cm³

(7.23)²h = 504

h=\frac{504}{(7.23)^{2}}

h = 9.64 cm                        

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