Answer:
Below
Explanation:
Trial 1 : v = d/t
v = 10 / 20
v = 0.5 m/s
Trial 2 :
v = 10 / 25
v = 0.4 m/s
Trial 3 :
v = 10 / 30
v = 0.33333....
2. Find average speed
0.5 + 0.4 + 0.333 = 1.2333
Divide by 3 : 0.41 m/s
Use t = d/v
t = 200 m / 0.41111 m/s
t = 486.486486486 s
Then just round to however your teacher wants
Hope this helps!
