Two workers

One worker makes a part 4 hours and the second 9 hours later than they would make the same part together. How long does it take for each worker to make the part himself?

Correct answer:

a =  10 h
b =  15 h

Step-by-step explanation:

a = 4 + s b= 9+s  s   (a1+b1)=1  s   (1/a+1/b)=1  s   (1/(4+s)+1/(9+s))=1  s ((9+s)+(4+s))=(9+s) (4+s)  s ((9+s)+(4+s))=(9+s) (4+s) s236=0 s1,2=±36=±6 s1=6 s2=6  s>0 s=s1=6  a=4+s=4+6=10 h

Our quadratic equation calculator calculates it.

b=9+s=9+6=15 h

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