Discussion

Explanation:

From 12 noon on 10th March till 8 pm on 18th March, total time elapsed is 200 hours.

The clock was 15 mins slow initially and finally was 25 mins ahead, hence it gained 40 mins.

Clock gained 40 mins in 200 hours.

For the clock to show correct time, it needs to gain 15 mins from the start.

Time taken to gain 15 mins = 15/40 × 200 = 75 hours.

75 hours from 12 noon 10th March will be 3 pm on 13th March.

Hence, option (a).

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