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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 rate speed 68 m/min. The area of the field is :
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Explanation:
BD = length of diagonal
= speed × time
52\60×15=13m
BD=√l^2+b^2
⇒l^2+b^2=13^2=169
Again, l+b=68\60×15=17
(l+b)=l^2+b^2+21b
17^2=169+21b
lb=120\2=60m^2