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​Q10: Question – Paper 3 – June 2018
Question
10) Here are three lamps.
Lamp A flashes every 20 seconds.
Lamp B flashes every 45 seconds.
Lamp C flashes every 120 seconds.

The three lamps start flashing at the same time.

​How many times in one hour will the three lamps flash at the same time?
[3 marks]