JSCE Mathematics 2023 Objective — Question 66
Question 66 of 80 from the Junior Secondary Certificate Examination (JSCE) Mathematics 2023 Objective paper, with the correct answer and a full explanation.
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Two lighthouses flash their lights every 30 seconds and 40 seconds respectively. Given that they flashed together 10am, when will they next flash together?
- A. 11:00
- B. 10:02Correct
- C. 10:05
- D. 10:07
Explanation
LCM of 30 and 40 = 120 seconds = 2 minutes. Next flash: 10:02.
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