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3 years ago

This question is confusing

Mathematics

2 answers:

UNO [17]3 years ago

6 0

Answer:

im thinking its 24.8 miles because you multiply 40 by .62

Step-by-step explanation:

Vladimir [108]3 years ago

5 0

Answer:

24.8 miles

Step-by-step explanation:

Mack lives 40km from Sed

The question wants you to convert 40km into miles

40 x 0.62 = 24.8

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Leto [7]

Let

x--------> the speed of the girl in step

y--------> the speed of the escalator in step

d------> the distance between ground and floor.

we know that

$speed=\frac{distance}{time} \\ \\ time=\frac{distance}{speed}$

when the girl is going up on escalator

$x-y=\frac{d}{60}$ ----> equation $1$

when the girl is going down on escalator

$x+y=\frac{d}{90}$ -------> equation $2$

Adds equation $1$ and equation $2$

$2x=\frac{d}{60} +\frac{d}{90} \\ \\ 2x=\frac{5}{180} d$

$x=\frac{5}{360}d$ --------> equation $3$

Time to climb (in step) with y=0 (escalator standing still)

$x*t=d\\\\ t=\frac{d}{x}$ -----> equation $4$

Substitute equation $3$ in equation $4$

$t=\frac{d}{\frac{5d}{360}} \\ \\ t=\frac{360}{5} \\ \\ t=72 steps$

therefore

the answer is

$72 steps$

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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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