Đáp án:
Gọi t' là thời gian ô tô tải đi đc từ lúc 5h đến 7h:
t'=7-5=2(h)
Quãng đường ô tô tải đi đc là
S=v1. t'= 40.2=80(km)
Thời gian để 2 xe gặp là:
tg=S/(v2-v1)=80/(60-40)=4(h)
Vậy 2 xe gặp nhau lúc: 7+4=11(h)
bài 1
thời gian ô tô tải đi trước là :
7-5=2[giờ]
2 giờ đi được , ô tô tải đi được là :
40*2=80[km]
hiệu vận tốc là :
60-40=20[km]
thời gian để ô tô du lịch đuổi kịp ô tô tải là:
80:20=4[giờ]
đến số giờ , ô tô du lịch đuổi kịp ô tô tải là :
7+4=11[giờ]
d/s:11 giờ
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