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:  Choose the correct choice from the following answers:
A) 430 sq . m B) 425 sq . m C) 450 sq . m D) 475 sq . m E) 350 sq . m
<gadget id="calculator">9 * 1_000</gadget>
<output>9_000</output>

<gadget id="calculator">360 * 10</gadget>
<output>3_600</output>

<gadget id="calculator">9_000 / 3_600</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">12 * (5/2)</gadget>
<output>30</output>

<gadget id="calculator">30 * 30</gadget>
<output>900</output>

<gadget id="calculator">900 / 2</gadget>
<output>450</output>

<result>C</result>
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:
divide(multiply(multiply(12, divide(multiply(9, const_1000), multiply(const_360, const_10))), multiply(12, divide(multiply(9, const_1000), multiply(const_360, const_10)))), const_2)
distance covered in ( 9 × 1000 ) / ( 3600 ) × 12 = 30 m diagonal of squarre field = 30 m . area of square field = 30 ( power ) 2 / 2 = 900 / 2 = 450 sq . m answer is c .