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3 years ago

An airplane flies 840 km in 1 hour. What is it’s average speed in kilometers per hour.

Mathematics

1 answer:

DochEvi [55]3 years ago

6 0

840 km/per hour, because it is traveling 840 km in one hour that is it’s average speed

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One airplane located 200km north and 50km east of an airport. A second plane at the same altitude is located 30km north and 100k

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Answer: 350

Step-by-step explanation:

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2 years ago

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Kevin is 3 years older than brendon two years ago Kevin was 4 times as old as brendon . How old is Kevin now

Tpy6a [65]

Answer:

Kevin is 6

Step-by-step explanation:

Let k represent Kevin's age now. Then Brendon's age now is (k-3). Two years ago the relationship of their ages was ...

k-2 = 4((k-3) -2)

k -2 = 4k -20 . . . . . eliminate parentheses, collect terms

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2 years ago

Louisa ran at an average speed of five miles per hour along an entire circular park path. Calvin ran along the same path in the

docker41 [41]

Answer:

15 miles

Step-by-step explanation:

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Then $x$ , the longitude is equal to the velocity times the time used to finish. So

$x=5t_{L}$

$x=6t_{C}$

And the difference between Louisa's time and Calvin' time is 30 minutes, half an hour. So:

$t_{C}=t_{L}-0.5$

Three equations, three unknowns, the system can be solved.

Equalizing the equation with x :

$5t_{L}=6t_{C}$

In this last equation replace $t_{C}$ with the other equation and solve:

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With Louisa's time find x:

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2 years ago

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Step-by-step explanation:

(3 - 2i)(3 + 2i)

Expand

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Add

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i^2 = ( $\sqrt{-1}$ )^2 = -1

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Add

(9 + 4)

= 13

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3 years ago

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2 years ago