Harish started his journey at 18:40 and finished at 22:20. The time taken in completing the journey is—

The correct option is 3 hours 40 minutes.

To find the total time taken for the journey, we need to calculate the duration between the start time and the finish time.

Step 1: Note down the given times.
Start time = 18:40
Finish time = 22:20

Step 2: Calculate the time difference.
We subtract the start time from the finish time:

$\text{Time taken}=22:20-18:40$

Step 3: Borrow minutes from the hours column if needed.
Since 20 minutes is less than 40 minutes, we borrow 1 hour (which equals 60 minutes) from 22 hours.
22 hours becomes 21 hours.
20 minutes becomes 20 + 60 = 80 minutes.
Now, the finish time can be written as 21 hours and 80 minutes.

Step 4: Perform the subtraction.
Hours: $21-18=3\text{hours}$
Minutes: $80-40=40\text{minutes}$

Therefore, the time taken in completing the journey is 3 hours 40 minutes.