Explanation: To determine the time taken to travel from Delhi to Shimla, we need to calculate the difference between the departure time and the arrival time. Tejas departs from Delhi at 6 pm and arrives in Shimla at 3 am the next day. To find the duration of the journey, we need to consider the time span across two days.
First, we calculate the time from 6 pm to midnight (12 am):
- From 6 pm to 12 am is 6 hours.
Next, we calculate the time from midnight (12 am) to 3 am:
- From 12 am to 3 am is 3 hours.
Adding these two durations together gives us the total travel time:
- 6 hours (from 6 pm to 12 am) + 3 hours (from 12 am to 3 am) = 9 hours.
Thus, the total time taken to travel from Delhi to Shimla is 9 hours.
Now, we need to classify the number 9 in terms of number types:
- **Natural Numbers**: These are positive integers starting from 1. The number 9 is a natural number.
- **Whole Numbers**: These are natural numbers including zero. The number 9 is a whole number.
- **Integers**: These are whole numbers and their negatives. The number 9 is an integer.
- **Rational Numbers**: These are numbers that can be expressed as a ratio of two integers. The number 9 can be expressed as 9/1, so it is a rational number.
- **Real Numbers**: These include all rational and irrational numbers. The number 9 is a real number.
Therefore, the number 9 is classified as a natural, whole, integer, rational, and real number.
In conclusion, the correct answer is (B) 9 hours; Natural, Whole, Integer, Rational, Real.