SPEED      TIME     DISTANCE
DOWNSTREAM         r+c        t        d
UPSTREAM           r-c        t        u

Let speed of the current be C

We then get: 

14(2 - C) = 7(2 + C) ------- Cross-multiplying

28 – 14C = 14 + 7C

– 14C – 7C = 14 – 28 

– 21C = - 14

C, or rate of current =  

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