Aptitude boat and stream

Boat and Stream problem are depends on concept of Speed, Time and Distance.

Still water

If the speed of the water in the river is 0 then it is called as Still water.

It is denoted as Bs.

Stream

If the water of a river is flowing at constant speed then it is called as stream.

It is denoted as Cs.

Down stream

In a river if a boat direction along the stream then it is called as Downstream.

It is denoted as Ds.

Down stream= still water+stream

Up stream

In a river if a boat against the stream then it is called as Up stream.

It is denoted as Us.

Up stream= Still water - Stream

Important Formula

1. Ds=Bs + Cs
2. Us=Bs–Cs
3. If the speed of a boat in still water is x km/hr and the speed of the stream is y km/hr, then

speed down stream=(x + y)km/hr

Speed Up stream= (x - y)km/hr

4. Speed of the boat in still water=( down stream speed+ upstream speed) / 2
5. Bs=(Ds + Us)/2

6. Rate of stream= (Ds-Us)/2

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