Question

A rectangular field is $72m$ by $58m.$ Amar walks around it at the rate of $3km$ per hour. How much time will he take in taking $2$ rounds?

Answer 1

Dimension of rectangular field $=72$ m by $58$ m

Perimeter of rectangular field $=2(l+b)$

$=2\times (72+58)$

$=2\times 130=260$ m

The distance took by Amar in taking two rounds $=2\times 260$ m

$=520$ m

Speed of Amar $=3$ km/hr

$=\frac{3\times 1000}{3000}$ m/sec $=\frac{5}{6}$ m/s

Total times taken $=\frac{\text{Distance}}{\text{Speed}}$

$=\frac{520}{\left(\frac{5}{6}\right)}=520\times \frac{6}{5}$

$=104\times 6$ seconds

$=\frac{624}{60}$ minutes

$=10.4$ minutes