Four bells toll at intervals of 40 mins, 60 mins, 75 mins and 45 mins. If they start

together:? After how many minutes will they next toll together?
After how many hours will they next toll together?
How many times will they toll together over a year?

This question is in my maths book in the chapter review section, but I'm sure I haven't covered it yet and my test's tomorrow! There's no sufficient working out in the book and I'm thoroughly stuck.
Does anyone know how to work this out??
Any advice or tips on how to work this out would also be appreciated :)
Thanks
 
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