Question

Mukesh walks around a circular track of radius 14 m with a speed of 4 km/hr. If he takes 20 rounds of the track, for how long does he walk?

Answer 1

Radius of circular track = r = 14 m
Perimeter of circular track $=2\pi r$
$=2\times \frac{22}{7}\times 14=88m$
Mukesh takes 20 rounds of the track.
Total distance covered $=20\times 88m=1760m$
According to question,
Time taken by Mukesh to walk 4 km
= 1 hr (60 min)
Time taken by Mukesh to walk 1 m
$=\frac{60min}{4000m}$
Time taken by Mukesh to walk 1760 m
$=\frac{60}{4000}\times 1760=26.4min$
Mukesh walks 26 min 24 sec = sec