幫幫我！數學！平均速率:總距離÷總時間?
回答 (1)
2017-04-03 9:02 pm
✔ 最佳答案
(8) t = s1 / v1 = 150 / 75 = 2 hrs2 = t * v2 = 2 * 50 = 100 km = Answer
(2) t1 = 72' / 60' = 1.2 hr
s = v1 * t1 = 30 * 1.2 = 36 km
t2 = s / v2 = 36 / 20 = 1.8 hr
v = 2s / (t1 + t2) = 72 / 3 = 24 km/hr = Answer
收錄日期: 2021-05-01 15:24:55
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170403071747AAe8o5O