Question

A person can walk at 3.6 km/hr. how long will he take to go around a
rectangle of sides 30 m and 40m?

Answer 1

3.6km/hr
$3.6 \times \frac{5}{18} = 1 \: m \gamma s$
perimeter of rectangle 2(a+b) =140m


he takes 1 second to go 1m
so he will take 140 seconds to go 140m

140 seconds =
$2 \times \frac{1}{3 } \: minutes$