A worker takes 3 hours to do a job. A new worker takes 5 hours. How long does it take them if they work together?

time taken by a worker= 1/3 hours

time taken by the new worker= 1/5 hours

time taken to complete the work if they work together

= 1/3 + 1/5

= 5+3/15

=8/15

=15/8 hours

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)

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116