Question

Question 68

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

Answer 1

Radius of the circular track = 14 m
Circumference of the circular track $=2\pi r=2\times \frac{22}{7}\times 14$
$=44\times 2=88m$
Total distance cover in 20 round $=88\times 20=1760m$
Speed of Mukesh on the circular track = 4 km/h
$=\frac{4\times 1000}{60}=\frac{2\times 100}{3}=\frac{200}{3}m/min$
Time taken by Mukesh $=\frac{1760}{\frac{200}{3}}=\frac{1760\times 3}{200}=\frac{1760\times 3}{200}=\frac{176\times 3}{20}=26.4min$
26.4 min = 26 min and 24 s