Thơi gian đi ô tô bằng thời gian đi xe đạp và bằng:
3 giờ 20 phút : 2 = 1 giờ 40 phút = 5/3 giờ
Quãng đường đi bằng ô tô là:
5/3 x 42 = 70 (km)
Vận tốc đi bằng xe đạp:
2/7 x42 = 12 (km/giờ)
Quãng đường đi bằng xe đạp:
12 x 5/3 = 20 (km)
Quãng đường AB là:
70 + 20 = 90 (km)
Đổi 3 giờ 20 phút =\(\frac{10}{3}\) giờ
Quãng đường đi được trong nửa thời gian đầu là :
42* (\(\frac{10}{3}\) : 2) =70 (Km )
Quãng đường đi được trong nủa thời gian sau là :
(42*\(\frac{2}{7}\) )*( \(\frac{10}{3}\) : 2) =20 (Km)
Quãng đường AB là :
70+20 =90 (Km)
Đáp số : 90 Km
nửa thời gian đầu người đó đi là
3 giờ 20 phút : 2 = 1 gờ 40 phút
1 giờ 40 phút = 10/6 giờ
quãng đường đi bằng ô tô là
42x 10/6 = 70 (km)
vận tốc xe đạp là
42 x 2/7 = 12 (km/giờ)
quãng đường đi bằng xe đạp là
12x10/6= 20 (km)
quãng đường AB là
70 +20 = 90 (km)
Đ/s : 90 km
ban HOÀNG THỊ THANH HUYỀN LAM ĐÚNG RỒI NHÉ
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