Question

Area of a circular field is 154m2 find the time taken to complete 2 rounds at the rate of5km/hr

Answer 1

Area of circle =

$\pi {r}^{2}$

Circumference of circle =

$2 \: \pi \: r$

Speed Formula

$speed \: = \frac{distance}{time}$

Time Formula

$time = \frac{distance}{speed}$

Answer 2

Step-by-step explanation:

Answer:-

48 min or 2880 seconds

Explanation :-

$area = 2\pi \: r$

$154 = 2 \times 3.14 \times r$

$154 = 6.28 \times r$

$r = \frac{154}{6.28}$

$r = 24.5$

Circumference of circle

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

$= 3.14 \times 24.5 \times 24.5$

$= 1884.7$

Therefore,

He completes two rounds at 5km/hr

He complete 3769. 4m at 1.3m/s

We have

Distance =speed/time

V =3769. 4/1.32

=2899.5 sec

= 48 min