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Step-by-step explanation:
1)
Speed of the boat ,B= 5km/hr
speed of the current,S = x km/hr
upstream = Boat speed - current speed
U = B - S = 5-x km/hr
Downstream= Boat speed + current speed
D = B + S = 5+x km/r
2)
let's take 50 rs note as X ,100 rs note as Y,
50X + 100Y = 800