A little bit outside Dhaka. Would there still be school?
The other thing to consider is the plausibility of an American school teacher in East pakistan during the war. Was English taught in village schools ("outisde Dhaka" would mean a village or small town) at the time? The war was a slow build-up; would foreigners not have been evacuated? I know there were foreign nurses there during and after the war but not sure about teachers.