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2 years ago

runs 5 kilometers in 0.5 hours rides bike 20 kilometers in 0.8 hpir how many kilometers can this person run in 1 hour

Mathematics

2 answers:

sergey [27]2 years ago

7 0

0.5 hrs is 30 mins
30/5 = 6

6 km
...

Gala2k [10]2 years ago

3 0

0.5 hours = 30 minutes
30 minutes = 5 km

So multiply by 2 to get 1 hour:
1 hour = 10 km

Answer = 10 km

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Let R be the radius of the bigger circle and r, be the radius of the smaller circle.

Then their ratio is given as,

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We can rewrite it as fractions to get,

$\frac{R}{r} = \frac{3}{1}$

We make R the subject to get,

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The area of the bigger circle can be found using the formula,

$Area=\pi {r}^{2}$

This implies that,

$Area=\pi ({3r})^{2}$

$Area=9\pi {r}^{2}$

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$27\pi=9\pi {r}^{2}$

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$3 = {r}^{2}$

This means that,
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The area of the smaller circle is therefore

$= \pi {( \sqrt{3}) }^{2}$

$= 3\pi$

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