how to solve this question it is very tough
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LET THE SPEED OF STEAMER BE X KM/hr
IN THE DOWNSTREAM THE SPEED OF STEAMER WILL BE ADDED
IN THE UPSTREAM THE SPEED OF STEAMER WILL BE SUBTRACTED
9(X+1)=10(X_1)
9X+9=10X_10
10X_9X=10+9
X=19
ANSWER =19 KM/HR
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