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Rina8888 [55]
3 years ago
14

A bus travels 20 km in 30 minutes. What is the average speed of the bus in km/hr?

Mathematics
1 answer:
sergeinik [125]3 years ago
8 0

Answer:

40 km

Step-by-step explanation:

You have 2 variables: km and minutes/hour

30 minutes turned into 60 minutes(1 hour) by multiplying by 2...

So you need to do the same for km!

20km * 2 = 40km per hour

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Step-by-step explanation:

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4 years ago
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What is the area of a rectangle with vertices at (−3, −1) , (1, 3) , (3, 1) , and (−1, −3) ?
kondaur [170]
The length of the side joining points (-3, -1) and (1, 3) is given by

l= \sqrt{(1+3)^2+(3+1)^2}  \\  \\ = \sqrt{4^2+4^2} = \sqrt{16+16}  \\  \\ = \sqrt{32}

The length of the side joining points (1, 3) and (3, 1) is given by

w= \sqrt{(3-1)^2+(1-3)^2} \\ \\ = \sqrt{2^2+(-2)^2} = \sqrt{4+4} \\ \\ = \sqrt{8}

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Thus, the area of the given rectangle is given by

Area=l\times w \\  \\ = \sqrt{32} \times \sqrt{8}  \\  \\ = \sqrt{32\times8} = \sqrt{256}  \\  \\ =\bold{16} \ units^2
7 0
3 years ago
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