Question

Nếu bể không có nước, người ta mở riêng vòi thứ nhất thì sau 6 giờ bể sẽ đầy. Mở hai vòi cùng một lúc thì sau 4 giờ bể sẽ đầy. Hỏi nếu mở riêng vòi thứ hai thì sau bao lâu bể đầy nước?
Trả lời: Riêng vòi hai chảy thì sau  giờ bể sẽ đầy.

Answer 1

chay trong :

1:(1/4-1/6)=12

D/S:12

k nha!

Answer 2

Mỗi giờ vòi thứ nhất chảy được :

 1 : 6 = 1/6 ( bể )

Mỗi giờ , cả hai vời chảy được :

 1 : 4 = 1/4 ( bể )

Muốn vòi thứ hai chảy đầy bể thì cần :

  1 : ( 1/4 - 1/6 ) = 12 ( giờ )

đ/s : 12 giờ

Answer 3

Vòi thứ nhất chảy 6 giờ là đầy. Nhưng cả hai vòi cùng chảy thì vòi thứ nhất chảy 4 giờ là đầy. Vậy 2 giờ còn lại của vòi thứ nhất do vòi thứ hai chảy.

=> vòi thứ hai chảy 4 giờ mới bằng vòi thứ nhất chảy trong 2 giờ.

Vậy vòi thứ hai chảy trong 12 giờ bể sẽ đầy.

Answer 4

12 gio nha

Answer 5

12 nhé

Answer 6

12 giờ

Answer 7

yes 12 đúng 

Answer 8

12 nhé

Answer 9

12 gio nhe ban 12 gio la dung 100%

:-)

Answer 10

Riêng vòi thứ 2 chảy thì sau số giờ để đầy bể là :

                  1:(1:4-1:6)= 12 (giờ)

                                 Đáp số:12 giờ           

Answer 11

12 nhé

Answer 12

12 giờ đó

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Answer 13

12 là sai 14

Answer 14

12 giờ đảm bảo với bạn là đúng

Answer 15

12 giờ đấy dễ quá

Answer 16

12 la dung day 14 la sai

Answer 17

12 giờ đấy dễ vay

Answer 18

1:(1/4-1/6)=12

Answer 19

Đúng là 12 đó

Answer 20

toi vua thi 14 dung 12 sai

Answer 21

12 nha

Answer 22

12 giờ nhé 

Answer 23

12 giờ đúng 100000000000000000000000000000000000% đấy nhé

Answer 24

12 giờ nha bạn đúng 100%

Answer 25

12 là đúng 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%

Answer 26

12 đúng đấy 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000% luôn

Answer 27

12 gio

Answer 28

12 giờ

Answer 29

12 đúng 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%

Answer 30

12 gio