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Find at what time between 9 and 10 o'clock will the hands of a clock be at 180°?
Correct Answer: B — 180/11 min past 9
Explanation:
The correct answer is 180/11 min past 9. At 9 o'clock the hands are 15 minute-spaces apart. For 180°, the minute hand must gain 15 more spaces (30 - 15 = 15). At 55 spaces per 60 min, 15 spaces = (60/55)×15 = 180/11 minutes past 9.