A clock loses 3 minutes every hour. It is set right at 12 noon. What is the true time when the clock shows 9:30 p.m. the same day?
Correct answer A. 10 p.m.
Explanation
The clock shows 57 minutes for every 60 true minutes. It has shown 570 minutes, so true time elapsed = 570 × 60/57 = 600 minutes = 10 hours, giving 10 p.m.
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