Machines X and Y always operate independently and at their respective constant rates. When working alone machine X can fill a production lot in 5 hours, and machine Y can fill the same lot in x hours. When the two machines operate simultaneously to fill the production lot, it takes them 2 hours to complete the job. What is the value of x?
A. 10/3
B. 7/3
C. 3
D. 5/2
E. 3/2

• Tg = t1.t2/(t1+t2)
  2=5x/(5+x)
  10 + 2x = 5x
  10 = 3x
  x = 10/3
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