light glows for every 14 seconds . how many times did it between 1 : 57 : 58 and 3 : 20 : 47 am
"the diff in sec between 1 : 57 : 58 and 3 : 20 : 47 is 4969 sec , 4969 / 14 = 354 so total 355 times light ll glow answer : e"
divide(add(add(const_2, 47), multiply(add(20, add(const_2, const_60)), const_60)), 14)