calculate how many seconds it will take for 4 bells to toll together again , given that they begin to toll together respectively at the intervals of 5 , 6 , 10 and 12 seconds . ?
"lcm of 5 , 6 , 10 and 12 is 60 lcm = 60 answer : b"
multiply(divide(10, const_2), multiply(5, 6))