The length of a rectangular floor is more than its breadth by 200%. If Rs. 640 is required to paint the floor at the rate of Rs. 5 per sq m, then what would be the length of the floor?	Select the correct option:  A) 19.6m.  B) 20.0m.  C) 19.3m.  D) 18.5m.  E) 18.9m.
Let the length and the breadth of the floor be l m and b m respectively.   l = b + 200% of b = l + 3= 
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<output>3</output>
3b   Area of the floor= 640/5= 
<gadget id="calculator">640/5</gadget>
<output>128</output>
128 sq m   l b= 128 i.e., l * l/3 = 128   l2 = 384 =&gt; l = 19.6m.   19.6m.NSWER:19.6m.
<result>A</result>
The length of a rectangular floor is more than its breadth by 200%. If Rs. 640 is required to paint the floor at the rate of Rs. 5 per sq m, then what would be the length of the floor?