Question 288456
If it takes 3 hours to travel 24 miles downstream and 6 hours to travel upstream, how fast is the current if the speed of the boat remains constant?
A 1 mph
B 2 mph
C 3 mph
D 4 mph
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The speed downstream is 24/3 mph = 8 mph
The speed upstream is 24/6 = 4 mph
The boat's speed is the average, = (4 + 8)/2 = 6 mph
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The current is difference, = 8-6 = 2 mph
B