A boat can travel at a speed of 12 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 256 km downstream. code example

Example: A boat covers a certain distance downstream in 1 hour, while it comes back in 1 hour 40 min. If the speed of the stream be 5 kmph, what is the speed of the boat in still water?

A boat covers a certain distance downstream in 1 hour, while it comes back in 1 hour 40 min. If the speed of the stream be 5 kmph, what is the speed of the boat in still water?