Rubina started her journey by car at 16:50 hours and finished at 21:15 hours…
2023
Rubina started her journey by car at 16:50 hours and finished at 21:15 hours on the same day. The time taken in completing the journey is :
- A.
4 hours 35 minutes
- B.
3 hours 25 minutes
- C.
4 hours 25 minutes
- D.
3 hours 35 minutes
Show answer & explanation
Correct answer: C
To find the elapsed time between a start clock reading and an end clock reading on the same day, subtract the start time from the end time separately in hours and minutes. Whenever the end time's minutes are smaller than the start time's minutes, borrow one hour from the hour column and add it as 60 minutes to the end time's minutes before subtracting.
The car journey started at 16:50 and ended at 21:15 on the same day.
Since the end time's minutes (15) are smaller than the start time's minutes (50), borrow 1 hour from the end hour: 21:15 becomes 20 hours and 75 minutes (20:75).
Subtract the minutes: 75 minus 50 equals 25 minutes.
Subtract the hours: 20 minus 16 equals 4 hours.
So the elapsed time works out to 4 hours 25 minutes.
Cross-check by adding this duration back to the start time: 16:50 plus 4 hours 25 minutes is 20:50 plus 25 minutes, which is 21:15 -- exactly the given finishing time, confirming the calculation.
Hence, the time taken to complete the journey is 4 hours 25 minutes.