A boat goes 8 km in one hour along the stream and 2 km in one hour against the stream. The speed in km/hr of the stream is ----
A
2
B
4
C
3
D
5
Correct Answer: 3
ধরি, নৌকার বেগ x km/hr স্রোতের বেগ y km/hr ∴ x + y = 8 x - y = 2 [ - করে] 2y = 6 ∴ y = 3