Question

Answer 1

Vận tốc trung bình:

\(v_{tb}=\dfrac{s_1+s_2}{t_1+t_2}=\dfrac{65+24,3}{\dfrac{65}{15\cdot3,6}+\dfrac{36}{60}}\approx49,51\left(\dfrac{km}{h}\right)\approx13,75\left(\dfrac{m}{s}\right)\)

Answer 2

\(36'=0,6h\)

15m/s=54km/h

Thời ô tô đi tu A đến B : \(t=\dfrac{s}{v}=\dfrac{65}{54}\approx1,2\left(h\right)\)

\(v_{tb}=\dfrac{s_1+s_2}{t_1+t_2}=\dfrac{65+34,3}{1,2+0,6}\approx19,3\left(kmh\right)\)