Why did India play aggressively in their 1st innings against Bangladesh?

India declared their first innings in second Test against Bangladesh in Kanpur at 285/9 in 34.4 overs. India's first innings started after lunch on Day 4 as Day 2 and Day 3 were washed out and only 35 overs were possible on Day 1. India batted aggressively to go for a win in the match as 235 overs were lost.