The distance between Zurich and town A is 24000m. Sunny and Joey go to Zruich from town A. If Sunny takes a bus with a speed of 8m/s and Joey drives her car at 16m/s, who will reach Zurich first?
If the bus carrying Sunny goes nonstop to Zurich while Joey' s car has broken down for 30 minutes on her way, who will reach Zurich first?
幾條數學速率應用題,幫下手!
2007-08-29 7:45 am
回答 (3)
2007-08-29 7:51 am
✔ 最佳答案
The time Sunny takes for travelling:24000 / 8
= 3000 s
= 50 minutes
The time Joey takes for travelling:
24000 / 16
= 1500 s
= 25 minutes
Therefore, Joey will reach Zurich first.
If Joey's car has broken down for 30 mins, the time Joey takes for travelling:
25 + 30
= 55 minutes
Therefore, Sunny will reach Zurich first if Joey' s car has broken down for 30 minutes on her way.
2007-08-29 00:35:41 補充：
Let t seconds be the time required for them to meet each other,16t 8t = 2400024t = 24000t = 1000* 1000s = 16 minutes and 40 secondsAs it takes 16 minutes and 40 seconds for them to meet on the road, the time they meet will be 2:16:40 p.m.
參考: =]
2007-08-29 7:55 am
我想同你講一d野
你條問題有錯誤
因為係Joey' s car has broken down for 30 minutes on her way
佢沒有說出joey's car行左幾耐
佢正係說出joey's car broken down for 30 minutes on her way
on the way根本無說出係幾時(姐係行左幾耐
唔該你cheak清楚先
你條問題有錯誤
因為係Joey' s car has broken down for 30 minutes on her way
佢沒有說出joey's car行左幾耐
佢正係說出joey's car broken down for 30 minutes on her way
on the way根本無說出係幾時(姐係行左幾耐
唔該你cheak清楚先
2007-08-29 7:51 am
sunny needs :24000m / 8m
= 3000s
joey needs : 24000m / 16m
= 1500s
:. Joey will reach Zurich first.
sunny needs : 24000m/8m
= 3000s
joey needs: 24000m/16m + 30mins x 60
= 1500s + 1800s
= 3300s
:. Sunny will reach first.
= 3000s
joey needs : 24000m / 16m
= 1500s
:. Joey will reach Zurich first.
sunny needs : 24000m/8m
= 3000s
joey needs: 24000m/16m + 30mins x 60
= 1500s + 1800s
= 3300s
:. Sunny will reach first.
收錄日期: 2021-04-13 13:10:10
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