Q:

A took 15 sec. to cross a rectangular field diagonally walking at the rate of speed 52m / min and B took the same time to cross the same field along its sides walking at the rated speed 68 m / min. The area of the field is: 

• 1
  $$30 m^2$$
• 2
  $$40 m^2$$
• 3
  $$50 m^2$$
• 4
  $$60 m^2$$