The area of a square field is 64816 sq m. How long will a lady take to cross the field diagonally at the rate of 7.2 km/hr? Choose the most appropriate option
A) 2 min
B) 4 min
C) 5 min
D) 3 min
E) 3.5 min
Area of a square field = 64816 sq m   Let the side of square = a   a^2 = 64816   =&gt; a = 254.59   3 miniagonal = (2)^(1/2) * a   = 1.414 * 254.59   =360   Speed of lady = 7.2 km / hour   = 7200 m / hour   = 120 m / min   Time taken by lady to cross the field diagonally = 360/120= 
<gadget id="calculator">360/120</gadget>
<output>3</output>
3 min   Answer 3 min
<result>D</result>
The area of a square field is 64816 sq m. How long will a lady take to cross the field diagonally at the rate of 7.2 km/hr?