Syntel Company Numerical Ability Pipes and Cistern

One pipe fills in 4 hrs and another in 5hrs when they both work alternately
how much time will be taken to fill the tank.

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Syntel Other Question

Can any one suggest me.. How will be the Selection Prosedure for Syntellect...?? Is both syntel and syntellect or same companies? One pipe fills in 4 hrs and another in 5hrs when they both work alternately
how much time will be taken to fill the tank.