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3 years ago

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Two trains left the station at the same time, one heading due east at 40 miles per hour and the other heading due west at 50 mil

es per hour. How far apart were they after 4 hours? A. 160 B. 200 C. 360 D. 400

1 answer:

Ivan3 years ago

3 0

well you have to see how far they have gotten after 4 hours. so 4*40=160 50*4=200. since it was opposite directions you add. so 160+200=360.

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Please be quick! I need this as soon as possible!

PolarNik [594]

Answer:

35

Step-by-step explanation:

40*3=120

120-85=35

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3 years ago

Convert 1 cal/(m^2 * sec * °C) into BTU/(ft^2 * hr * °F)

Crazy boy [7]

Answer:

$1\ \frac{\text{cal}}{m^2\times sec\times ^\circ C}=0.03926\frac{\text{BTU}}{ft^2\times hr\times ^\circ F}$

Step-by-step explanation:

To find : Convert $1\ \frac{\text{cal}}{m^2\times sec\times ^\circ C}$ into $\frac{\text{BTU}}{ft^2\times hr\times ^\circ F}$

Solution :

We convert units one by one,

$1\text{ m}^2=10.7639\text{ ft}^2$

$1\text{ sec}=\frac{1}{3600}\text{ hour}$

$1\text{ cal}=0.003968\text{ BTU}$

Converting temperature unit,

$^\circ C\times \frac{9}{5}+32=^\circ F$

$1^\circ C\times \frac{9}{5}+32=33.8^\circ F$

So, $1^\circ C=33.8^\circ F$

Substitute all the values in the unit conversion,

$1\ \frac{\text{cal}}{m^2\times sec\times ^\circ C}=\frac{0.003968}{10.7639\times \frac{1}{3600}\times 33.8}\frac{\text{BTU}}{ft^2\times hr\times ^\circ F}$

$1\ \frac{\text{cal}}{m^2\times sec\times ^\circ C}=\frac{0.003968}{0.101061}\frac{\text{BTU}}{ft^2\times hr\times ^\circ F}$

$1\ \frac{\text{cal}}{m^2\times sec\times ^\circ C}=0.03926\frac{\text{BTU}}{ft^2\times hr\times ^\circ F}$

Therefore, The conversion of unit is $1\ \frac{\text{cal}}{m^2\times sec\times ^\circ C}=0.03926\frac{\text{BTU}}{ft^2\times hr\times ^\circ F}$

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3 years ago

A diver is 25 feet below sea level. After he swims up 15 feet toward the surface, what is his elevation?

Nataly [62]

The person above me is right!! I kinda got confused because i thought it was asking what sea level is the diver now BUT its asking for the elevation, so you need to subtract.

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3 years ago

jaxon earned $90 at his job when he worked for 9 hours . what was his hourly pay rate in dollars per hour ?

user100 [1]

Answer:

$10 dollars

Step-by-step explanation:

10x9=90

3 0

3 years ago

Read 2 more answers

I'm so confused!!!!! Can somebody plz help me!!!plz

ZanzabumX [31]

I would suggest looking up a converter chart, I don't know all of them but I can help with some.
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3 years ago