Two lighthouse beams, A and B, both flash at the same time.
Beam A flashes every 15 minutes.
Beam B flashes every 18 minutes.
Both beams flash together at 9:45 am.
At what time will both beams next flash together?
Practise Edexcel GCSE Maths Prime Factors, HCF and LCM with exam-style questions for Foundation and Higher tier. 59 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
