Srikant can row 9 1 3 kmph in still water and finds that it takes him thrice as much time to row up ...........

Explanation:

Speed in still water = 9 (1/3) = 28/3 km/hr
i.e, ½ (x+y) = 28/3 km/hr
=½ (x+3x) = 28/3
2x = 28/3 = x = 28/ 2 x 3 = 14/3 km/hr
rate upstream = 14/3 km/hr and
rate downstream = 14/3 x 3 = 14 km/hr
speed of the current = ½ (x-x) = ½ (14 – 14/3)
= ½ (42-14/3) = 28/6 = 4 (2/3) km/hr