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chie52996
2 năm trước
Hai thành phố A và B cách nhau 100km.Lúc 7h, một ôtô khởi hành ở A chuyển động thẳng đều về B với độ lớn vận tốc 80km/h. Sau đó, một xe gắn máy khởi hành ở B chuyển động thẳng đều ngược chiều với xe ô tô với độ lớn vận tốc 40km/h. Hai xe gặp nhau ở vị trí cách B 20km . Hỏi xe gắn máy khởi hành lúc mấy giờ?
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