[tex]V_{sr}=\frac{s_c}{t_c} \\ \\ s_c = s_1 + s_2 \\ \\ s_c = 3.5h \times 50 \frac{km}{h} + 1.5h \times 70 \frac{km}{h} \\ \\ s_c = 175km + 105km \\ \\ s_c = 280km \\ \\ V_{sr}= \frac{280km}{3.5h + 1.5h} \\ \\ V_{sr}=56 \frac{km}{h} \\ [/tex]
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[tex]V_{sr}=\frac{s_c}{t_c} \\ \\ s_c = s_1 + s_2 \\ \\ s_c = 3.5h \times 50 \frac{km}{h} + 1.5h \times 70 \frac{km}{h} \\ \\ s_c = 175km + 105km \\ \\ s_c = 280km \\ \\ V_{sr}= \frac{280km}{3.5h + 1.5h} \\ \\ V_{sr}=56 \frac{km}{h} \\ [/tex]