Distance Between Walkers

Adam and Boris go from school on two perpendicular paths. Adam's average speed is 6 km/h, and Borisova's is 8 km/h. How far will they be by air for 0.5 hours?

Final Answer:

s =  5 km

Step-by-step explanation:

$$\begin{gathered} v_1=6\text{km/h} \\ {v}_2=8\text{km/h} \\ t=0.5\text{h} \\ {s}_1=v_1\cdot t=6\cdot 0.5=3\text{km} \\ {s}_2=v_2\cdot t=8\cdot 0.5=4\text{km} \\ s=\sqrt{s_1^2+s_2^2}=\sqrt{3^2+4^2}=5\text{km} \end{gathered}$$

Try another example