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Start learning 50% faster. Sign in nowLet the Speed of the boat in still water B And Speed of Stream =S Let downstream speed be (B+ S) and upstream speed be (B - S) Now, 
By multiplying 8 with eq (i) and 5 with eq (ii) we get 
Subtracting eq (iv) from eq (iii) we get, 
B+S =364/26 B+S =14 Putting the of (u + v) in eq (ii) we get, 
B-S =12. Now, To move 35 km downstream and 27 km upstream time = 35/14 + 27/12 =2.5+ 2.25 =4.75 =4 hours 0.75×60 minutes. =4 hours 45 minutes.
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