Question

how long would a boy take to complete one round of a circular park whose radius is 210m if his speed is 3 km\hr?

Answer 1

speed of boy = 3km/h
distance covered in 1 round=2πr
=2×22/7×210
=2×22×30
=44×30
=1320m
=1.320km
time taken= d/s
=1.320/3
=0.44 h
=(0.44×60)min
=26.4 minutes