WBCS Exam Main Compulsory Question Paper VI - 2015 [ Arithmetic and Test of Reasoning ]

1. Five bells tolled together and since then they began to toll at intervals [tex]3{1 \over 3}[/tex], [tex]2{2 \over 5}[/tex], [tex]2{2 \over 7}[/tex], [tex]2{2 \over 9}[/tex] and [tex]2{1 \over 2}[/tex] secs. They will again toll together after (A) 3 minutes (B) 4 minutes (C) 5 minutes (D) 6 minutes