There are eight friends J, K, L, M, N, O, P, Q. They all are travelling to different cities in different months but not necessarily. Cities are Delhi, Kolkata, Mumbai, Kanpur, Indore, Gwalior, Nagpur, and the months in which they are traveling are January, March, April, June, September, October, November, and December.

M is traveling after at least six people and he goes to Gwalior. More than four people go between M and L who go just before O. N goes to Kolkata but not in the month having 31 days. Four persons are traveling between the person who is traveling to Kolkata and Kanpur. K is traveling just after the person who goes to Delhi. Only one person is traveling between the person who goes to Patna and Kanpur, L is not traveling to Patna and Indore. Only two people are traveling between the person who is traveling to Indore and P who is traveling after Indore. P did not go in the month having 31 days. The person who is traveling to Mumbai goes before Nagpur. Person J is traveling after Q. Q is not traveling in the month of January.