Respuesta :

Answer:

21.25 m/s

Explanation:

AVERAGE SPEED=

[tex] = \frac{s1 t1+ s2t2 + s3t3}{t1 + t2 + t3} [/tex]

[tex] = \frac{20 \times 10 + 30 \times 5 + 15 \times 5}{10 + 5 + 5} [/tex]

[tex] = \frac{200 + 150 + 75}{20} [/tex]

[tex] = \frac{425}{20} [/tex]

[tex] = 21.25 ms[/tex]