F.1數..唔識
2007-07-15 9:48 am
edwarｄ ran from hk to Guangzhow at an average of 4km/h and then back at 3km/h. if he spenta total of 91 hours for the trip. what is the distance betweenhk and Guangzhou?
回答 (2)
2007-07-15 10:03 am
✔ 最佳答案
let x be the hour needed for running from hk to Guangzhow at an average of 4km/h4x = 3(91 - x)
4x = 273 - 3x
x = 39
distance = 4 * 39 = 156km
參考: myself
2007-07-15 10:42 pm
Let xkm be the distance between hk and Guangzhou.
x/4 + x/3 = 91.
7x = 1092
x= 156
So the distance between hk and Guangzhou is 156 km.
x/4 + x/3 = 91.
7x = 1092
x= 156
So the distance between hk and Guangzhou is 156 km.
收錄日期: 2021-04-13 00:46:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070715000051KK00354