A pipe network consists of a pipe of 60 cm diameter and branches out at a point F into two branches, one of 30 cm diameter and the other of 45 cm diameter. These branch pipes rejoin at a point B. The velocity in the first branch ( of 45 cm diameter) is 1.5 m/sec. Which one of the following statements is true ?

- 1
  
  The velocity in the second branch is 1.0 m/sec.
- 2
  
  The velocity in the second branch is 2.25 m/sec.
- 3
  
  The velocity in the second branch is 2/3 (=0.667) m/sec.
- 4
  
  The potential drop between F and B in both branches is the same.

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