A motorboat spends $1$ hour and $50$ minutes sailing downstream the river for $20$ km and sailed back upstream the river.Next time it spends $54$ minutes sailing $12$ km downstream the river and 8 km upstream the river.Calculate the speed of the boat in still water and the speed of the current of the river.
Calculate the speed of the boat in still water?
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word-problem
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0This is hard to parse. If it takes $110$ minutes to go $20$ km downstream, then going $12$ km downstream would take $\frac {12}{25}\times 110=52.8$ minutes. So...something seems awry. – 2017-02-13
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0Typo: should have written $\frac {12}{20}\times 110=66$. The point remains the same. – 2017-02-13
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1I interpret there are two trips: 110 min for a trip of 20 km down and 20 km up and another of 54 min for 12 down and 8 up. – 2017-02-13
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0yeah thats true – 2017-02-14