Vivian Chen 發問時間： 社會與文化語言 · 9 年前

# harder math question

John was rowing down a river when his hat was blown off by a sudden gust of wind. After 10 minutes, he found out, turned the boat around and rowed back upstream to find his hat. Then after 2 minutes, he reached the hat. If the current is constant and John rows at a constant rate, what is the rate of the current?

dear paul,

i am also middle school and i am in a international school too. It is already summer vacation but my tutor give me a this kind of question and i do not know how to write it can you just tell me the solution and answer. please! thankyou.

2 個已更新項目:

sorry grammar wrong "a kind"

### 1 個解答

• 9 年前
最佳解答

also assume that the hat stay at where it was blown off,

c = rate of the current

r = rate of John rows

the distant John's boat float = 10c = the distance John row back = 2(r-c)

use minus sign since c and r in opposite direction

10c = 2(r-c) = 2r - 2c

12c = 2r

c = r/6

answer: "rate of the current" = one sixth of "rate of John rows" (in opposite direction)

2011-06-23 15:23:33 補充：

well, 國中, 讀外僑 - I hope you can solve similar questions by yourself now

2011-06-24 12:51:56 補充：

Vivian,

I gave you step by step solution and completed with the answer already. Which part don't you understand??

Was it English or math?

Uncle Paul

參考資料： self, uncle Paul
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