a boat is going 144 miles upstream on a river. the speed of the boat in still water is 60 miles per hour. the speed of the river
current is 80% less than the speed of the boat in still water. how long does the journey take?( in hours)
1 answer:
Answer:
Let b = rate of the boat.
Let r = rate of the river.
The rate going downstream is b + r.
The rate going upstream is b - r.
rate x time = distance
4(b + r) = 144 ---> b + r = 36 [divide both sides by 4]
9(b - r) = 144 ---> b - r = 16 [divide both sides by 9]
Add town: 2b = 52
Divide by : b = 26 mi/hr
r = 10 mi/hr
Step-by-step explanation:
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