Problem: the width of a rectangle is 10 mtr and its area is 150 square meter . if length of the rectangle is increased , then its new area is 1 ( 1 / 3 ) times of the original area . what is the new perimeter of the rectangle ? 
Options: ['a ) 45', 'b ) 54', 'c ) 67', 'd ) 60', 'e ) 69']
d