0580/12 May/Jun 2023, Question 20: HCF and LCM
Cambridge IGCSE Mathematics 0580 · Paper 12 (Core) · Calculator · 3 marks
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The question, in short
Buses to the port leave every 28 minutes and to the town every 48 minutes, with both leaving together at 10 18. Find the next time both leave together.
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Solution · 3 marks
- 128 = 2 × 2 × 7, 48 = 2 × 2 × 2 × 2 × 3
- 2LCM = 2 × 2 × 2 × 2 × 3 × 7 = 336 minutes
- 3336 minutes = 5 hours 36 minutes
- 410 18 + 5 h 36 min = 15 54
Answer15 54 or 3 54 pm
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Also searched as: 0580/12/M/J/23 · 0580_s23_qp_12 · 0580 s23 12 · question 20.
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