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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#)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

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

Quãng đướng AB nếu mỗi giờ 60km thì đến B lúc 14 giờ là :

 60 x 14 = 840 (km)

Quãng đường AB nếu mỗi giờ chạy 40km thì đến B lúc 16 giờ là :

 40 x 16 = 640 (km)

Mỗi giờ 60km thì đến B lúc 14 giờ đi được quãng đường là

\(\text{ 60 x 14 = 840 (km)}\)

Mỗi giờ chạy 40km thì đến B lúc 16 giờ đi được quãng đường là

\(\text{ 40 x 16 = 640 (km)}\)

Hiệu 2 vận tốc:

60 - 40=20(km/h)

Sau khi ô tô tới B thì xe máy cần phải chạy thêm:

40 x 2= 80(km)

Ô tô chạy quãng đường AB mất:

80:20=4(giờ)

Quãng đường AB dài:

 4 x 60 = 240(km)

Hiệu thời gian là :
16 giờ - 14 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)

Hiệu 2 vận tốc:

60 - 40=20(km/h)

Sau khi ô tô tới B thì xe máy cần phải chạy thêm:

40 x 2= 80(km)

Ô tô chạy quãng đường AB mất:

80:20=4(giờ)

Quãng đường AB dài:

 4 x 60 = 240(km)

                         ĐS

a,800

b,50

lười viết