Ajay takes 46 hours to row 130 km upstream and 260 km downstream. Additionally, he takes 34 hours to row 90 km upstream and 208 km downstream. What is the speed of Ajay in still water?

The speed of a motorboat in still water is 15 km/h. It travels 30 km downstream and returns to the starting point in a total time of 4 hours 30 minutes. What is the speed of the stream (in km/h)?

The speed of a motorboat in still water is 15 km/h. It travels 30 km downstream and returns to the starting point in a total time of 4 hours and 30 minutes. What is the speed of the stream (in km/h)?