A boat leaves Astoria and travels upstream on the Columbia river for 5 hours. The return trip only takes 3.6 hours because the b
oat travels 4 miles per hour faster downstream due to the current. How far does the boat travel up the Columbia? Suppossed to solve as an in equality?
1 answer:
Answer:
10.285 miles
Step-by-step explanation:
Given that:
Upstream travel time = 5 hours
Return trip travel time = 3.6 hours
Let upstream travel speed = x mph
Downstream travel speed = x + 4 mph
Distance = speed * time
Upstream distance = x * 5 = 5x
Downstream distance = (x + 4) * 3.6
5x = (x + 4) * 3.6
5x = 3.6x + 14.4
5x - 3.6x = 14.4
1.4x = 14.4
x = 10.285714
x = 10.285 miles
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