how long would a boy take to walk once round a circular park whose diameter is 420 m if his speed is 3 km/h.
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D=2r
420=2r
210=radius
Circumference=2pi×radius
c=2×22/7×210
=44/7×210
=1320m
speed = 3000m/hr
time=distance / speed
=1320/3000
=0.44
=26.4min
420=2r
210=radius
Circumference=2pi×radius
c=2×22/7×210
=44/7×210
=1320m
speed = 3000m/hr
time=distance / speed
=1320/3000
=0.44
=26.4min
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