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Sagot :
Answer:
- 2 2/9 hours
Step-by-step explanation:
Speed upstream is reduced:
- 13 - 4 = 9 mph
Time to travel 20 miles:
- 20/9 = 2 2/9 hours
Answer:
20/9 hours
Step-by-step explanation:
Note: I'm assuming 'upstream' means against the current.
If the boat flows against the current, it's speed is 13 - 4 = 9 mph.
[tex]\frac{20m}{9mph} =\frac{20}{9} hours[/tex]
That means our answer is 20/9 hours.
If it is travelling with the current, its speed is 13 + 4 = 17 mph.
Therefore, 20/17 would be our answer if that were the case
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