how long would a boy take to walk once round a circular park whose diameter is 420 m if his speed is 3kmperhour?
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Circumference = 420/2×22/7×2
= 70×22=1540m
speed=5/6 m/s
Time= 1540÷5/6
= 1540×6/5
=308×6
=1854 secs
i.e. 30 mins 54 secs
= 70×22=1540m
speed=5/6 m/s
Time= 1540÷5/6
= 1540×6/5
=308×6
=1854 secs
i.e. 30 mins 54 secs
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