a,800

b,50

lười viết

tỉ số giữa 2 vận tốc là : 60:40=3/2 vì khi đi cùng 1 quáng đường thì vận tốc tỉ lệ nghịch vs thời gian nên Nếu thời gian đi quáng đường AB vs vận tốc 60km/h là 2 phần thì là 3 phần như thế 

Một phần thời gian nhiều hơn ứng vs : 

17 - 15 = 2h

vậy vs vận tốc 60km/h ô tô đi từ Ađến B mất "

2+2=4h

quáng đường AB dài là :

60*40=240 (km)
k mk nha mn 

#)Giải :

                  Vận tốc 60km so với 40km là :

                               60 : 40 = 3/2 

                  Vậy thời gian ô tô đi 60km bằng 3/2 thời gian ô tô đi 40km 

                  Thời gian đi 60km hơn thời gian đi 40km là :

                              17 giờ - 15 giờ = 2 ( giờ ) 

                   Thời gian ô tô đi hết quãng đường AB là :

                              2 : ( 3 - 2 ) x 3 = 6 ( giờ ) 

                    Quãng đường hai tỉnh AB dài là :

                              6 x 40 = 240 ( km )  

                                        Đ/số : ............................

             #~Will~be~Pens~#

Bài này lập Tỉ số và lập luận nhé!!!

                                                                   Bài Giải:

                                                  Quãng đường hai tỉnh AB là:

                                                             60 x 15 + 60 = 960 (km)

                                                                       Đáp số: 960 km

240km đúng 100%

một ô tô chạy từ tỉnh a đến tỉnh b . Nếu chạy với vận tốc 60km/giờ thì ô tô sẽ đến b lúc 15  giờ  . Nếu chạy với vận tốc tốc 40km/giờ thì đến b lúc 17 giờ. Hỏi

a, Hai tỉnh và b cách nhau bao nhiêu ki-lô-mét ?

b,Ô tô phải chạy với vận tốc bao nhiêu để đến b lúc 16 giờ ?

Một xe máy chạy từ A nếu chạy mỗi giờ 40km thì đến tỉnh bê lúc 18.00 nếu chạy mỗi giờ 30km thì đến tỉnh bê lúc 18.30 tính quãng đường Abbiết sẽ không nghỉ trong lúc chạy

240km

Ta có tỉ lệ vận tốc của xe ô tô đó lúc đi 40 km/giờ và 60 km/giờ là 2/3

Nếu đi với vận tốc nhanh thì thời gian sẽ ngắn hơn và đi với vận tốc chậm thì thời gian sẽ dài hơn nên ta có tỉ lệ thời gian của thời gian đi 40 km/ h và thời gian đi 60 km/h là 3/2

Hiệu thời gian là :

17 giờ - 15 giờ = 2 giờ

Thời gian đi 60 km là :

2 x 2 = 4 giờ ( vì thời gian đi 60 km là 2 phần )

Quãng đường AB là :

60 x 4 = 240 ( km )

Đ/S:.........

240 km

Quãng đướng AB nếu mỗi giờ 60km thì đến B lúc 15 giờ là :

            60 x 15 = 900 (km)

Quangc đường AB nếu mỗi giờ chạy 40km thì đến B lúc 18 giờ là :

            40 x 17 = 680 (km)

                    Đ/S : .....

Nếu chạy 60km/h thì QĐ sẽ bằng:

60 x 15 = 900km

Nếu chạy 40km/h thì QĐ sẽ bằng:

40 x 17 =  680km

hok tốt 

#~DCT3,14~

680 km bạn nhé

240 km bạn nhé

     Tỉ số giữa 2 vận tốc là : 60:40==3/2  Vì khi đi cùng một quãng đường thì vận tốc tỉ lệ nghịchvới thời gian nên :    «Nếu thời gian đi quãng đường AB với vân tốc 60km /h là 2 phần thì là 3 phan nhu the»

Mot phan thời gian nhiều hơn ứng với :

 17-15=2(gio)

Vậy với vận tốc 60 km /h ô tô đi từ A đến B mất :

   2  + 2=4(gio)

 Quãng đường AB dài là :

  60  4= 240(km)

Đúng đó đáp số là 240

Đúng 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