A boat having a length 7 m and breadth 2 m is floating on a lake. The boat sinks by 1cm when a man gets on it. The mass of the man is: Choose the correct answer:
A) 140 kg
B) 60 kg
C) 72 kg
D) 96 kg
E) none of these

Rationale: "explanation : volume of water displaced = ( 7 x 2 x 0.01 ) m 3 = 0.14 m 3 . ∴ mass of man = volume of water displaced x density of water = ( 0.14 x 1000 ) kg = 140 kg . answer : a"
Answer: A