One month, ruby worked 6 hours more than isaac, and svetlana worked 4 times as many hours as ruby. together they worked 138 hours find the number of hours each person worked

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)