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3 years ago

A. 29 B. 24 C. 20 D. 14

Mathematics

2 answers:

slava [35]3 years ago

3 0

The answer is C. Hope that helps

miv72 [106K]3 years ago

3 0

Answer:

C. 20

Step-by-step explanation:

1.) x + 36 = 14 + 3x + 54

2.) -2x + 36 = 14 + 54

3.) -2x + 36 = 68

4.) -2x = 32

5.) x = -16

6.) -16 + 36 = 20

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2 years ago

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3 years ago

An airplane travels 290 km between Austin and Dallas in 1 h 15 min. What is it’s average speed?

aniked [119]

The average speed of the plane between Austin and Dallas is 232 kmph

Solution:

Given that,

Total distance traveled by airplane = 290 km

Time taken for travel between Austin and Dallas = 1 hour 15 minute

Let us convert the time taken to hours

$\begin{array}{l}{1 \text { minute }=\frac{1}{60} \text { hours }} \\\\ {15 \text { minutes }=\frac{15}{60}=\frac{1}{4}} \\\\ {\text { 1 hour } 15 \text { minutes }=1 \frac{1}{4} \text { hours }=\frac{1 \times 4+1}{4}=\frac{5}{4} \text { hours }}\end{array}$

The average speed is given as:

$\text { Average speed }=\frac{\text { total distance }}{\text { total time taken }}$

Plugging in the values, we get,

$\text { Average speed }=\frac{290}{\frac{5}{4}}=\frac{290}{5} \times 4=232$

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2 years ago