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# Algebra

5.A boy spent \$24 on rowing, always hiring a boat at \$1.5 per hour or a better one at \$2 per hours. Had he spent on the first what he actually spent on the second, and on the second what he actually spent on the first, he could have had two hours more on the water. How much did he spend on the better boat?

6. A party of tourists set out for a station 4 km distant and go at the rate of 4 km an hour. After going 3/4 km , one of them has to return to the starting point; at what rate must he now travel in order to reach the station at the same time as the others? Assume that all speeds are uniform.

### 2 個解答

• ?
Lv 7
6 年前
最佳解答

5.A boy spent \$24 on rowing, always hiring a boat at \$1.5 per hour or a better one at \$2 per hours. Had he spent on the first what he actually spent on the second, and on the second what he actually spent on the first, he could have had two hours more on the water. How much did he spend on the better boat?

He hired better boat for 9 hours and 4 hours for the cheaper one.

6. A party of tourists set out for a station 4 km distant and go at the rate of 4 km an hour. After going 3/4 km , one of them has to return to the starting point; at what rate must he now travel in order to reach the station at the same time as the others? Assume that all speeds are uniform.

The ONE needs to walk at the speed of 76/13 kmph. But can he wait for Trinity just once?

2015-07-27 08:08:49 補充：

小蜜蜂跟我說的.我一看就知道是9了啊.

2015-07-28 01:41:52 補充：

> 我這樣想，想知道有否更佳辦法。

我不必算就有小蜜蜂告訴我答案.這應該是最好的辦法吧.

• 6 年前

其實第五題是怎計出來的？

2015-07-27 01:00:35 補充：

9 × \$2 + 4 × \$1.5 = \$24 - play for 9 + 4 = 13 hours

2015-07-27 10:29:54 補充：

{ x + y = 24

{ x/1.5 + y/2 = x/2 + y/1.5 + 2

妳的答案是以上設法的 x/2，是對的。

我這樣想，想知道有否更佳辦法。