Two automated irrigation pumps, Pump P and Pump Q, both start at the same time.
Pump P runs every 20 minutes.
Pump Q runs every 28 minutes.
Both pumps start together at 4:50 pm.
At what time will both pumps next start at the same time?
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.