A steamer moves with velocity 3 km/h in and against the direction of river water whose velocity is 2 km/h. Calculate the total time for the total journey if the boat travels 2 km in the direction of a stream and then back to its place:

The steamer's downstream speed is its speed relative to the water plus the stream velocity, which is $3 + 2 = 5$ km/h, and its upstream speed is $3 - 2 = 1$ km/h. The time taken to travel the $2$ km downstream is $2 / 5 = 0.4$ hours. The time taken to travel the $2$ km back upstream is $2 / 1 = 2$ hours. The total time for the journey is $0.4 + 2 = 2.4$ hrs.

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