A boat goes 280 miles downstream in the same time it can go 210 miles upstream. The speed of the current is 6 miles per hour. Find the speed of the boat in still water. Anyone know how to solve this?

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Anonymous Tue Nov 16 04:00:54 2010 No.2063691 [Reply] [Original]

A boat goes 280 miles downstream in the same time it can go 210 miles upstream. The speed of the current is 6 miles per hour. Find the speed of the boat in still water. Anyone know how to solve this?

>>	sage sage !79cfdX7bxM Tue Nov 16 04:14:54 2010 No.2063736 cancer hw thread. I'll hint anyway. (V+6) * t = 280 (V-6) * t =210 find V*t, and remember not2cancer

Anonymous Tue Nov 16 04:16:54 2010 No.2063747

the speed of the boat plus water going downstream is S+6
the speed of the boat minus water going upstream is S-6
it took a time 'T' to travel 280 miles downstream
so 280/(S+6) = T
it took the same time 'T' to travel 210 miles upstream so 210/(S-6)
T = T
you can take it from here?

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