Cook batted for 251 minutes and faced 209 balls, striking a six and ten fours in the process.
The third wicket duo has so far put on 110 runs in 186 balls. For the record, Cook has batted for 960 minutes in all in the three innings he has batted during the series.
With three more days left in the second game of the four-match series in which India are 1-0 ahead, a result is on the cards on a track that is aiding the spin bowlers.
In Image: India's Ajinkya Rahane gets hit by a sweep shot of Kevin Pietersen