Question

8. How long will a man take to go walking at 4 km per hour, twice around a circular garden of 70 m
radius?​

Answer 1

Answer:

the answer is 13.2 minutes

Step-by-step explanation:

Circumference of a circle = 2 pi r,  

Where r is the radius of the circle.

Given the radius of the circular garden = 70 meters.

Circumference of the circular garden = 2 x 22/7 x 70 = 440 metres.

Given that the man needs to go about 2 rounds of the circular garden.

So, the distance the man needs to walk = 440 x 2 = 880 meters  

Given the speed of the man = 4 kmph = 4000 meters per hour

Time = Distance / Speed

   = 880 / 4000

   = 0.22 hours = 0.22 x 60 = 13.2 minutes

So, the man takes 13.2 minutes to walk around the circular garden twice.

hope this helps

Answer 2

Answer:

we know that 1km= 100000cm

so 100000/560

=1375/7

c=2x22/7*r

=44/7r=1375/7

r= 1375/7*7/44

r = 31.25cm