Question

A rectangular field is 72 m by 58 m. Amar walks
round it at the rate of 3 km per hour. What time
will he take in taking 2 rounds.
​

Answer 1

Answer:

$\red{\textbf{Answer :- 10.4 min}}$

Step-by-step explanation:

$\red{\textbf{Given :-}}$

$\textsf{A rectangle field is 72m by 58m}$

$\textsf{rate of walking = 3km/hr}$

$\red{\textbf{To find :-}}$

$\textsf{Time taken in 2 rounds}$

$\textsf{SO,}$

$\textsf{Dimension of rectangular field =72cm by 58}$

$\textsf{Perimeter of rectangular field =2(l+b)}$

$\textsf{=2×(72+58)}$

$\textsf{=2×130=260m}$

$\textsf{The distance took by Amar in taking two}$

$\textsf{rounds =2×260m }$

$\textsf{=520m}$

$\textsf{Speed of Amar=3 km/hr}$

$= \LARGE \frac{3 \times 1000}{3000}$m/s

$= \LARGE \frac{5}{6}$ m/s

$total \: time \: taken \: = \LARGE\frac{distance}{speed}$

$= \LARGE \frac{520}{ \frac{5}{6} } = \small 520 \times \LARGE\frac{6}{5}$

$= 104 \times \LARGE\frac{6}{60}$

$= 10.4 \: min$

$\textsf{so, time taken in 2 rounds = 10.4 min}$