List of top Quantitative Aptitude Questions on Boats and Streams

A boat goes 30 km downstream in 2 hours and returns the same distance upstream in 3 hours. The speed of the stream is:

A boat covers 24 km downstream in 2 hours and 12 km upstream in 2 hours. Find the speed of the boat in still water.

A boat covers a distance of 30 km downstream in 2 hours, while it takes 6 hours to cover the same distance upstream. What is the speed of the boat in km per hour?