Question

a person can run around a circular path of radius 21 metres in 4 seconds at what time will be the same person run a distance of 3 kilometre?

Answer 1

Answer:

Circumference of circular path=2*22/7*21

=132m

In 4 sec he can run 132m

In ? sec he can run 3000m

4*3000/132=90 sec

= 1 min and 30 sec

Answer 2

The same person run a distance of 3 kilometre in 90.90 seconds

Step-by-step explanation:

1 km = 1000 m

21 m = 0.021 km

Radius of circular path = 21 m = 0.021 km

Circumference of circular path = $2 \pi r = 2 \times \frac{22}{7} \times 0.021=0.132 km$

So, Time taken to travel 0.132 km = 4 seconds

Time taken to travel 3 km = $\frac{4}{0.132} \times 3=90.90 seconds$

Hence the same person run a distance of 3 kilometre in 90.90 seconds

#Learn more:

Athlete runs around a circular path 10 times if the diameter of park is 28 cm find the distance covered by the athlete in kilometre

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