A man weighing 80 kg is standing at the centre of a flat boat and he is 20 m from the shore. He walks 8 m on the boat towards the shore and then halts.The boat weight 200 kg. How far is he from the shore at the end of this time ?
A. 11.2 m
B. 13.8 m
C. 14.3 m
D. 15.4 m