Book Maths Puzzle

What is the greatest number which divides 24, 28 and 34 and leaves the same remainder in each case

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Book Other Question

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 ? Three numbers which are co-prime to each other are such that the product of the first two is 119 and that of the last two is 391. What is the sum of the three numbers?