Question

How long will a man take to go, walking at $13.2km/h$ round circular garden of $700m$ radius?

• A. $12minute$
• B. $30minute$
• C. $20minute$
• D. none of these

Answer 1

The correct option is C $20minute$

Given, $\Rightarrow$ Radius of garden $\left(r\right)=700m$

$\Rightarrow$ Circumference of garden $=2\pi r$

$=2\times \frac{22}{7}\times 700$

$=4400m$

$=\frac{4400}{1000}km$

$=4.4km$

$\Rightarrow$ Given speed $=13.2km/hr$

$\Rightarrow$ Total time taken $=\frac{Totaldistance}{Speed}$

$=\frac{4.4}{13.2}$

$=0.3333$

$=0.3333\times 60$ [ Since $1hr=60minutes$ ]

$=20minutes$