Discussion
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 :
Answer: C
The journey took 4 hours 25 minutes.
Count on from the start time:
\[ \begin{aligned} 16{:}50 \to 17{:}00 &= 10\ \text{min} \\ 17{:}00 \to 21{:}00 &= 4\ \text{h} \\ 21{:}00 \to 21{:}15 &= 15\ \text{min} \end{aligned} \]
Total: 4 hours and 10 + 15 = 25 minutes. As a check, 16:50 plus 4 hours is 20:50, and 25 more minutes reaches 21:15. The other options miscount either the minutes or the hours.
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