The subject matter of Boats and Streams Questions is quite essential as these questions are there in nearly all competitive exams from the topic. It is also included in Aptitude section of many job test in companies like TCS, Infosys etc.The idea is not that hard to fathom rather it is somewhat connected to the area of Speed, Distance and Time. When a boat is supposed to go downstream if it moves along with the course of the stream. The boatâ€™s net speed in this scenario is known as the downstream speed. When a boat is assumed to go upstream if it moves along in the way opposite to the course of the stream. The boatâ€™s net speed in this scenario is known as the upstream speed.Speed of the boat is given by half of sum of upstream and down stream speed and speed of the stream by half of difference between downstream and upstream speed.Speed Downstream is equal to sum of the speed of boat and speed of stream. Speed Upstream is equal toÂ speed of the stream subtracted by speed of the boat.

Rules:

When the speed of the boat or swimmer is â€˜xâ€™ km per hour and the streamâ€™s speed is â€˜yâ€™ km per hour, then:

The speed of the swimmer or boat upstream = (x – y) km per hour

The speed of the swimmer or boat downstream = (x + y) km per hour

In the stationary or still water

The speed of the boat is given by = 1/2 (downstream speed + upstream speed)

The speed of the stream is provided by = 1/2 (downstream speed â€“ upstream speed)

A certain distance in p1 hours is covered by a man when he rows downstream and comes back the equal distance upstream in p2 hours. If the streamâ€™s speed is assumed as s km/hr, then the manâ€™s speed in still water will be: s ( p2+ p1)/ ( p2-p1) km/hr