Question

Quãng đường AB dài 120 km. Lúc 5 giờ sáng , một ô tô đi từ A đến B mất 2 giờ 30 phút. Một xe máy cũng đi từ A đến B với vận tốcbằng 2/5 tốc của ô tô và xuất phát cùng lúc với ô tô . Hỏi xe máy đến B sau ô tô bao lâu

Answer 1

Đổi 2 h 30 phút=2,5 giờ

Ô tô đi từ A đến B hết:

Vận tốc của ô tô:120:2,5=48(km/giờ)

Vận tốc của xe máy:48*\(\frac{2}{5}=19,2\)(km/giờ)

Xe máy đến B sau :120:19,2=6,25(giờ)

Xe máy sẽ đến sau ô tô :6,25-2,5=3,75(giờ)=3h45 phút

 

Answer 2

Cậu làm đúng rồi đấy, tớ cũng ra 3 giờ 45 phút

Answer 3

3 giờ 45 phút

Answer 4

bạn Nandini làm đúng rồi

Answer 5

3 GIỜ 45 PHÚT

Answer 6

3 giờ 45 phút đúng 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%

Answer 7

chịu

Kb nhé

Bạn dì ơi

Answer 8

mình ko biết

Answer 9

đúng khẳng định 99,999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999%