The Ford car left Hanoi for Nghe An and the Audi car left Nghe An for Ha Noi at the same time. The ratio of their speeds...

T

Thu

30 tháng 3 2019

The Ford car left Hanoi for Nghe An and the Audi car left Nghe An for Ha Noi at the same time. The ratio of their speeds (the Ford car to the Audi car) was 4 : 3. The Ford decreased its speed by 25% and the Audi car increased its speed by 25% after they had passed each other.
When the Ford car reached Nghe An, the Audi car was still 20km away from Hanoi. The distance between Hanoi and Nghe An is ...... km.

#Toán lớp 8

0

PH

Phạm Hoàng Anh

9 tháng 3 2017

The Ford car left Hanoi for Nghe An and the Audi car left Nghe An for Ha Noi at the same time. The ratio of their speeds (the Ford car to the Audi car) was 4 : 3. The Ford decreased its speed by 25% and the Audi car increased its speed by 25% after they had passed each other.
When the Ford car reached Nghe An, the Audi car was still 20km away from Hanoi. The distance between Hanoi and Nghe An is ...... km.

#Toán lớp 8

1

HD

Ha Do Thu

9 tháng 3 2017

đáp án là 560

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PH

Phạm Hoàng Anh

14 tháng 3 2017

thanks

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VP

Vũ Phương Thảo

14 tháng 12 2017

The Ford car left Hanoi for Nghe An and the Audi car left Nghe An for Ha Noi at the same time. The ratio of their speeds (the Ford car to the Audi car) was 4 : 3. The Ford decreased its speed by 25% and the Audi car increased its speed by 25% after they had passed each other.
When the Ford car reached Nghe An, the Audi car was still 20km away from Hanoi. The distance between Hanoi and Nghe An is ...... km.

#Toán lớp 8

0

BD

Bình Dị

16 tháng 2 2017

Nâng cao nhe:The Ford car left Hanoi for Nghe An and the Audi car left Nghe An for Ha Noi at the same time. The ratio of their speeds (the Ford car to the Audi car) was 4 : 3. The Ford decreased its speed by 25% and the Audi car increased its speed by 25% after they had passed each other.
When the Ford car reached Nghe An, the Audi car was still 20km away from Hanoi. The distance between Hanoi and Nghe An is ...... km.

#Toán lớp 8

2

BD

Bình Dị

16 tháng 2 2017

sax sao đăng lên violympic được đây

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BD

Bình Dị

16 tháng 2 2017

xin lỗi lúc mình mới đăng bài hiện ở trang TA???? nên mình hoảng

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BD

Bình Dị

16 tháng 2 2017

Làm thử nào các bạn(mình thì chịu thôi):The Ford car left Hanoi for Nghe An and the Audi car left Nghe An for Ha Noi at the same time. The ratio of their speeds (the Ford car to the Audi car) was 4 : 3. The Ford decreased its speed by 25% and the Audi car increased its speed by 25% after they had passed each other. When the Ford car reached Nghe An, the Audi car was still 20km away from Hanoi. The distance between Hanoi and Nghe An is .........

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#Toán lớp 8

1

BD

Bình Dị

16 tháng 2 2017

ôi nhầm trang

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NM

Nguyễn Minh Hằng

6 tháng 4 2019

1.The Ford car left Hanoi for Nghe An and the Audi car left Nghe An for Hanoi at the same time. The ratio of their speeds (the Ford car to the Audi car) was 4:3. The Ford car decreased its speed by 25% and the Audi car increased its speed by 25% after they had passed each other. When the Ford car reached Nghe An, the Audi car was still 20 km away from Hanoi. The distance between Hanoi and Nghe An is .... km 2.The smallest value of A= \(\frac{x-y}{x^{4}+y^{4}+6}\)...

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#Toán lớp 8

0

MN

Michael Nguyễn 2k3

5 tháng 4 2017 - olm

The Ford car left Hanoi for Nghe An and the Audi car left Nghe An for Ha Noi at the same time. The ratio of their speeds (the Ford car to the Audi car) was 4 : 3. The Ford decreased its speed by 25% and the Audi car increased its speed by 25% after they had passed each other.When the Ford car reached Nghe An, the Audi car was still 20km away from Hanoi. The distance between Hanoi and Nghe An is ...... kmTrả lời kỹ càng giúp mjk nha :))) Nghiêm cấm mấy thành phần trả lời I...

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#Toán lớp 8

0

NT

Nguyễn Tấn Dũng

10 tháng 4 2017

Mr.Joseph drives car from A to B at a constant speed. If the speed of the car is increased by 20%, it takes him one hour less than the usual time. If he drives at the constant speed for the first 100km before increasing the speed by 30%, it also takes him one hour less than the usual. The distance of AB is ..........km.

#Toán lớp 8

3

DK

duy khang nguyễn

12 tháng 4 2017

Gọi S là quãng đường
v là vận tốc

t là thời gian Mr.J đi thường ngày

=>\(\dfrac{S}{120\%v}=t-1\)

\(\dfrac{100}{v}+\dfrac{S-100}{130\%v}=t-1\)

=>\(\dfrac{S}{120\%v}=\dfrac{100}{v}+\dfrac{S-100}{130\%v}\)

<=>\(\dfrac{130S}{156v}=\dfrac{15600+120S-12000}{156v}\)

<=>\(10S=3600\)

<=>\(S=360\)

Xong rầu đó khỏi cảm ơn

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MD

Mỹ Duyên

11 tháng 4 2017

Đáp án: AB = 360 km

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AT

Anh Thư

14 tháng 2 2017 - olm

Chiếc xe Ford rời Hà Nội cho Nghệ An và chiếc xe Audi rời Nghệ An về Hà Nội cùng một lúc. Tỷ lệ tốc độ của họ (các xe Ford với chiếc xe Audi) là 4: 3. Ford giảm tốc độ của nó bằng 25% và chiếc xe Audi tăng tốc độ của nó bằng 25% sau khi họ đã đi qua nhau.
Khi chiếc xe Ford đạt Nghệ An, chiếc xe Audi vẫn còn 20 km đi từ Hà Nội. Khoảng cách giữa Hà Nội và Nghệ An là ...... km.

#Toán lớp 8

2

D0

Dũng 007

14 tháng 2 2017

120km

ok

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AT

Anh Thư

15 tháng 2 2017

cách giải chi tiết

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