Mathematics
NULL
Medium
Question
A man rows 9⅓ km/h in still water and takes thrice as long upstream as downstream for the same distance. Find the current speed.
A
3 1/3 km/hr
B
3 1/9 km/hr
C
1 1/4 km/hr
D
4 2/3 km/hr
✓ Official correct answer
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A
3 1/3 km/hr
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B
3 1/9 km/hr
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C
1 1/4 km/hr
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D
4 2/3 km/hr
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Explanation
(b+c)/(b−c) = 3 ⇒ b = 2c ⇒ c = (28/3)/2 = 4⅔ km/h.