Every month we place 5200 students

For one month we work for 160 hours
i.e 8 hours in a day * 21 working days in a month = 160 hours

∴ For 1 month : 160 hours * 60 mins = 9600

Placements for minute : 5200 / 9600 = 0.5

∴ Every 2 mins = 1 Placements