Math, asked by riya9898, 1 year ago

how long should a boy take to walk once around a circular Park whose diameter is 420 m is his speed is 3 km/h.

please solve this question in rough copy

riya9898: can anyone answer the question

Answers

Answered by siddhartharao77

Given Diameter d = 420m

Then, radius r = (d/2) = (420/2) = 210m.

We know that perimeter of circle = 2 π r

= > 2 * (22/7) * (210)

= > (2 * 22 * 210)/7

= > 9240/7

= > 1320 m.

= > 1.32 km.

Now,

Given Speed = 3 km/hr.

We know that Time = Distance/Speed

= > 1.32/3

= > 0.44 hours

= > 0.44 * 60

= > 26.4 minutes.

= > 26 minutes 24 seconds

Hope it helps

riya9898: because in the last of my book it is written the answer this only

siddhartharao77: Actually, 26.4 minutes = 26 minutes and 24 seconds only!

riya9898: but how

siddhartharao77: 1 minute = 60 seconds. Then 0.4 minutes = 24 seconds!

riya9898: ok

riya9898: thank you so much

siddhartharao77: its ok!

riya9898: nice maths bro

siddhartharao77: thank you!

riya9898: wlcm

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