Question

how long will a man take to go walking at 4 km per hour twice around a circular garden of 70 metre radius ​

Answer 1

Answer:

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.