數學題理解請幫忙列式
4. Two cyclists start off at the same time from the same place in two opposite directions at 45 km/h and 51 km/h. How long will it take if they are 288 km apart?
5. Mary and John start walking from the same place the same time but in the opposite directions at 2 m/s and 2.5 m/s respectively. How far away will they be after 4 s?
6. Car A and Car B had a race. Car A was going at 64 km/h while car B at 56 km/h. Car B started one hour earlier. How long will it take Car A to overtake Car B?
請幫忙計算列式(最緊要列式)
2008-04-29 7:00 pm
回答 (2)
2008-04-29 7:22 pm
✔ 最佳答案
4. they will take:288/(45+51) [distance/speed = time]
= 3 hours
5. they will be far away each other after 4s:
(2+2.5) x 4 = 18m [speed x time = distance]
6. Car A will overtake Car B
56/(64-56) [because car B drived 56km before car A start; their speed different is 64-56, distance/speed = time)
= 7 hours
參考: myself
2008-04-29 7:23 pm
4.
288/(45+51) = 3
Ans: 3 hours
5.
(2+2.5) x 4 = 18
Ans: 18m
6.
(56 x 1)/(64-56) = 7
Ans: 7 hours
開始時相距/每小時追近之距離
288/(45+51) = 3
Ans: 3 hours
5.
(2+2.5) x 4 = 18
Ans: 18m
6.
(56 x 1)/(64-56) = 7
Ans: 7 hours
開始時相距/每小時追近之距離
收錄日期: 2021-04-23 17:53:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080429000051KK00595