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Aneli [31]
3 years ago
8

A runner covers a distance of 1200m with an average speed of 4m/s. How long does it take to run this distance? Then calculate th

e time in min.
Be the first answer for Brainliest, please I need help.
Mathematics
1 answer:
Nadusha1986 [10]3 years ago
8 0

Answer:

5mins

Step-by-step explanation:

well i did 1200 divided y 4 then divided that answer by 60

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Fine length of BC on the following photo.
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Answer:

BC=4\sqrt{5}\ units

Step-by-step explanation:

see the attached figure with letters to better understand the problem

step 1

In the right triangle ACD

Find the length side AC

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AC^2=AD^2+DC^2

substitute the given values

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step 2

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substitute the given values

cos(\angle CAD)=\frac{16}{8\sqrt{5}}

cos(\angle CAD)=\frac{2}{\sqrt{5}} ----> equation A

step 3

In the right triangle ABC

Find the cosine of angle BAC

cos(\angle BAC)=\frac{AC}{AB}

substitute the given values

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step 4

Find the value of x

In this problem

\angle CAD=\angle BAC ----> is the same angle

so

equate equation A and equation B

\frac{8\sqrt{5}}{16+x}=\frac{2}{\sqrt{5}}

solve for x

Multiply in cross

(8\sqrt{5})(\sqrt{5})=(16+x)(2)\\\\40=32+2x\\\\2x=40-32\\\\2x=8\\\\x=4\ units

DB=4\ units

step 5

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Applying the Pythagorean Theorem

BC^2=DC^2+DB^2

substitute the given values

BC^2=8^2+4^2

BC^2=80

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3 years ago
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AnnZ [28]

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740000

Step-by-step explanation:

100ps make up £1, so times 7400 by 100 to get the answer

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3 years ago
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