Question

A doctor said to his compounder "I go to see the patients at their residence after every 3 hours 30 minutes. I have already gone to the patient 1 hour 20 minutes ago and next time I shall go at 1:40 P. M." At what time this information was given to the compounder by the doctor?
1. 11:30 A. M.
2. 11:20 A. M.
3. 10:10 A. M.
4. None of these

Answer 1

Correct Answer - Option 1 : 11:30 A. M.

Doctor go to see the patients at their residence after every 3 hours 30 minutes.

Next time he go to at 1:40 P. M.

It means before 1:40 P. M. he  visited the patients = 1:40 - 3 hours 30 minutes

= 10 : 10 A. M.

Doctor said to his compounder I have already gone to the patient 1 hour 20 minutes ago = 10:10 + 1 hours 20 minutes

= 11:30 A. M.

Hence, this information was given to the compounder by the doctor at 11:30 A. M.