Final answer:
Rohan's internet appointment had a duration of 30 minutes as stated in the question, so the correct answer is option b) 30 minutes. No calculations or adjustments to this period are indicated, so it remains a straightforward answer.
Step-by-step explanation:
The duration of Rohan's Internet appointment is simply the amount of time he was scheduled for the consultative session. In this case, there is no need for a calculation as the question directly provides us with the answer.
The duration of Rohan's internet appointment is b) 30 minutes.
Understanding time and its measurement is a fundamental concept in mathematics. The question states that Rohan had an internet appointment with a duration of 30 minutes of consultative time. This directly indicates that the entire appointment was set for a half-hour period. No additional information suggests that there were extra minutes before the start or after the end of the appointment that would add to this duration. Therefore, based on the information given, the duration of Rohan's Internet appointment is 30 minutes, which is option b). There's no indication that this time frame should be adjusted, so other options such as 15 minutes, 45 minutes, or 60 minutes are not correct.