Question

Arun walks around a cicular track of radius 14 meters with the speed of 4 km /hrs. if he takes 20 round of it then how much time he walks?

Answer 1

Radius of the circular track = 14 m
Speed of walking = 4 km/hr

Circumference of the path =
$2 \: \pi \: r \\ 2 \times 22 \div 7 \times 14 \\ 2 \times 22 \times 2 \\ 88m {}^{2}$
now because he is walking with 4 km / hr speed so we will divide the area by 4 km / hr

he will complete 2 round in =
$.88 \div 4 = .22 \: hrs \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \: 22 \: min.$
now for 20 rounds =
$20 \times.22 = 4.4 \: hrs$