Subject: mathqa
Question: a girl walking at the rate of 9 km per hour crosses a square field diagonally in 12 seconds . the area of the field is :
Option: 
A: 425 sq . m', 'c ) 450 sq . m', 'd ) 475 sq . m', 'e ) 350 sq . m']
B: 430 sq . m', 'b ) 425 sq . m', 'c ) 450 sq . m', 'd ) 475 sq . m', 'e ) 350 sq . m']
C: 450 sq . m', 'd ) 475 sq . m', 'e ) 350 sq . m']
D: 475 sq . m', 'e ) 350 sq . m']
Answer: C