Engineering Board Exam Reviewer · Clock Problems · hard
At approximately what time after 12 o'clock will the hour and the minute hands of a clock form an angle of 120° for the second time?
- 50 min and 30 sec
- 43 min and 38 sec
- 38 min and 35 sec
- 30 min and 45 sec
Answer
B. 43 min and 38 sec
Solution
Using x=60H+2 /11 with H=0 and =240° (using 240° instead of 120° because this is for the second time), x=2(240)/11 43.64 minutes = 43 min and 38 sec.
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