4MA1/2F Nov 2021, Question 13: HCF and LCM
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 3 marks
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The question, in short
Trains to New Delhi leave every 40 minutes and to Mumbai every 48 minutes, both at 6 am. Find the next time trains to both destinations depart Agra simultaneously.
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Solution · 3 marks
- 1List multiples of 40: 40, 80, 120, 160, 200, 240
- 2List multiples of 48: 48, 96, 144, 192, 240
- 3Find the first common multiple: 240 minutes
- 4Convert 240 minutes to hours: 240 ÷ 60 = 4 hours
- 54 hours after 6 am is 10:00 am
Answer10:00 am
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