The area of a square field is 4050 sq m. How long in seconds will a lady take to cross the field diagonally at the rate of 4.5 km/hr?
Area of a square = 1/2 (D) 2= 4050 where D is diagonal, So D 2 = 8100 So D = 90m So time taken by a lady to cover diagonal = Distance/speed = 90m/4.5 kmph = 90m/{4.5 × (5/18 m/s)} = 72 sec
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