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Frank can row 30 miles down stream in 2 hours and 12 miles upstream in 3 hours what is the rate he rows in still water and the rate of the current?
Wiki User
∙ 14y ago
Let 'F' be Frank's rowing speed,
and 'C' be the speed of the current.
Downstream:
F + C = 30 / 2 = 15 mph
Upstream:
F - C = 12 / 3 = 4 mph
Add the two equations:
2 F = 19 mph
Frank = 9.5 mph
Current = 15 - R = 5.5 mph
Check:
Subtract the two equations:
2 C = 11 mph
C = 5.5 mph yay !
Wiki User
∙ 14y ago
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