Hai ô tô cùng khởi hành từ hai bến cách nhau 175km để gặp nhau. Xe thứ nhất có vận tốc 30km/h. Vận tốc của xe thứ hai là 35km/h. Biết xe thứ nhất đi sớm hơn xe thứ hai là 1h30'. Hỏi kể từ khi xe thứ nhất khởi hành, sau mấy giờ thì hai xe gặp nhau? lập pt

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