bacteria cell divides every one minute it takes 15 mins a cup to be one- forth full. how much tyme it takes to full the cup

1. 30 mins
2. 45 mins
3. 60 mins
4. 17 mins

bacteria cell divides every one minute it takes 15 mins a cup to be one- forth full. it takes time to full the cup is 17 minutes becoz every one minutes becomes double,generally bacteria devides by binary fisson ie- every one divison two new bacteria is produced.