請詳細解釋下條點做 :
Two radio transmission stations A and B are 100km apart. the transimission distances from station A and station B are 45km and 30km respectively. Peter drives from station A to station B at a speed of 50km/h and he cannot receive any transmission signals from both station A and station B after 1 minutes. Find the possible range of values of t
橫式是: 45<50t<100-30 (點解咁計)
急!F5 inequalities unknown 2q5
2012-10-02 4:18 am
回答 (1)
2012-10-02 4:45 am
✔ 最佳答案
As the transimission distances from station A and station B are 45km and 30km respectively.Peter cannot receive any signal between the interval 45 - 70 km from station A
Notice that the speed of the car is 50 km/h
So, possible range of values of t
45/50 < t < 70/50
0.9 < t < 1.4 (hours)
or 54 < t < 84 (minutes)
收錄日期: 2021-04-13 19:00:31
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20121001000051KK00578