Speed upstream = 27/9 = 3 kmph
Speed down stream = 81/3 = 27 kmph
Speed of stream = ½ (27-3) = 12 kmph
If sushi rows 27 km upstream and 81 km down steam taking 9 hours each, then the speed of the stream
Options:
A: 12 kmph
B: 13 kmph
C: 22 kmph
D: 20 kmph
E: 15 kmph