Question

How long will a man take to make a round of a circular field of radius 21 m , cycling at the speed of 8 km/hr​

Answer 1

Answer:  59.4 seconds.

Step-by-step explanation:

Circumference = 2πr

=>  $2 X \frac{22}{7} X 21$

=>  132m

Since 1km = 1000m

=>  132m = $\frac{132}{1000}$ = 0.132km

$Time = \frac{Distance}{Speed}$

=>  Time = $\frac{0.132}{8}$

=>  Time = 0.0165 hours...

Now, Since 1 hour = 60 × 60 = 3600s

=> 0.0165 hours = 0.0165 × 3600

=>  Time = 59.4 seconds

Therefore, the time taken by the man who cycling at the speed of 8km/h on circular field is 59.4 seconds.