Correct Answer - Option 4 : 168 sec
Given
Side of square = 175m
Speed of horse = 15 km/hr
Formula used
\(Speed = \;\frac{{Distance}}{{Time}}\)
Calculation
Perimeter of Square = 4 × side of square
⇒ 4 × 175 = 700m
⇒ Speed of horse= = 15 km/hr
⇒ Change the speed from km/hr to m/sec
∴ 1 km/hr = 5/18 m/sec
⇒ 15 km/hr × 5/18
⇒ 25/6 m/sec
⇒ \(Time = \;\frac{{Distance}}{{Speed}}\)
⇒ \(Time = \;\frac{{700}}{{\frac{{25}}{6}}}\)
⇒ 168 sec