question_answer

A traveller starts from a certain place on a certain day and travels 1 km on the first day and on subsequent days, he travels 2 km more than the previous day. After 3 days, a second traveller sets out from the same place and on his first day he travel) 12 km and on subsequent days he travels 1 km more than the previous day. On how many days will the second traveller be ahead of the first?

A)  7                    

B)  6            

C)  8                    

D)  9