book Maths Puzzle Numerical Ability

Word problem help: Five bells begin to toll together and then at intervals of 3,5,7,8 and 10 seconds respectively. Find after what interval they will again toll together ??

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I do not understand how to do this question. I tried making a chart and finding the slope, but it didn't help. e_e;;

Help on this problem would be greatly appreciated. Thank you List all the prime numbers between 45 and 80.