Book Maths Puzzle

Six bells start ringing together and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. how many times will they ring together in 60 minutes ?

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Book Other Question

What is the least number which when divided by 8, 12, 15 and 20 leaves in each case a remainder of 5 ? What is the greatest number which divides 24, 28 and 34 and leaves the same remainder in each case