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An và Bình cùng khởi hành từ A đến B trên quãng đường dài 120km. An đi xe máy với vận tốc 45km/h. Bình đi ô tô khởi hành sau Hà 20 phút với vận tốc 60km/h. a) Binhg phải đi mất bao nhiêu thời gian để đuổi kịp An? b) Khi gặp nhau, Bình và An cách B bao nhiêu km
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