Can o7r11 and written statement be filed together?

Written statement and application u/order 7 rule 11 cpc can be filed simultaneously no restrictions. Application under order 7 rule 11 cpc can be filed at any stage of suit but before conclusion of trial .

What about counter claim? Like 7-11 application, can it be filed anytime during the trial or does it have 90days limit like the written statement?

Written statement should be filed within 90 days.

The proposed petition under order vii rule 11 can be filed even after filing the written statement or simultaneously or anytime before the trial begins.