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một người đi xe đạp từ a và dự định đến b và một giờ đã định khi còn cách b 30 km người đó là nhận thấy rằng sẽ đến nơi muộn nửa giờ nếu giữ nguyên vận tốc đang đi do đó người ấy tăng vận tốc thêm 5 km trên giờ và đến b sớm hơn nửa giờ so với dự định tính vận tốc lúc đầu của người đi xe đạp
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