Quãng đường người đó đi được trong giờ thứ ba là:
(15 + 19) : 2 = 17 (km)
Trung bình mỗi giờ người đó đi được:
(15 + 19 + 17) : 3 = 17 (km)
Đ/S: 17 km
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ket qua dung la 17 km ban nhe
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177777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777
Giờ thứ ba người đó đi được số km là:
(15 + 19) : 2 = 17 (km)
Trung bình mỗi giờ người đó đi được số km là:
(15 + 19 + 17) : 3 = 17 (km)
Đáp số: 17 km
