The behavior of a jet discharged in the middle of a long line of jets in a coflowing environment was modeled using a hybrid approach. The integral and length-scale approaches were combined to model the dispersion of a jet in a coflowing environment. As a typical length-scale model, the jet was divided into a number of distinct regimes in which a single parameter formed from a combination of the goving parameters dominates over the behaviour of a jet. In each of these regions we gave an integral solution which adequately describes the behavior of the jet. A set of length-scales was then defined for the transitions between each of the regions. It was found that the hybrid model could predict the velocity decay and radial growth of a jet as it moves downstream from the source and merges with ambient fluid in a coflowing environment. Comparisons computational results with the laboratory data for merging jet in a coflow indicate that the hybrid model predicts the behavior of the jet in each of the regimes well.