A boat goes 28 km upstream and while retuning downstream covered 25% more distance covered in upstream. If boat takes 4 hr more to cover upstream than downstream. Find the speed of current (In km/hr), if speed of boat in still water is 2 m/s?

The boat speed of 2 m/s is converted to 7.2 km/hr by multiplying by 3.6. The downstream distance is 28 km plus 25% of itself, totaling 35 km. Using the given condition that the time difference between upstream and downstream is 4 hours, we write the equation 28 divided by (7.2 minus y) minus 35 divided by (7.2 plus y) equals 4, where y is the stream speed. Solving this quadratic equation gives the positive value of y as 5 km/hr.

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