List of top Quantitative Aptitude Questions on Boat and Stream

The speed of stream is $\frac{4{5}$ of the speed of a boat in still water. If the boat covers 198 km in 11 hours downstream, then find the difference of time taken by boat to cover 60 km in upstream and 36 km downstream.}
A boat takes 2 hours to travel downstream a river from port A to port B, and 3 hours to return to port A. Another boat takes a total of 6 hours to travel from port B to port A and return to port B . If the speeds of the boats and the river are constant, then the time, in hours, taken by the slower boat to travel from port A to port B is
A boat which can travel at 10km/hr in still water goes 91km down a river and returns to the starting point in 20 hours. Find the speed of the flow of the river.