v1= s1/t
t=s1/v1
s1=250m + x
v1=5m/s
t=(250m+x)/(5m/s)
v2=s2/t
v2=5m/s :2 = 2,5 m/s
s2=x
t=x/(2,5m/s)
(250m+x)/(5m/s)=x/(2,5m/s) /*5m/s
250m + x = 2x
250m = x
t=s1/v1= 250m/(2,5m/s)=100s
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v1= s1/t
t=s1/v1
s1=250m + x
v1=5m/s
t=(250m+x)/(5m/s)
v2=s2/t
t=s1/v1
v2=5m/s :2 = 2,5 m/s
s2=x
t=x/(2,5m/s)
(250m+x)/(5m/s)=x/(2,5m/s) /*5m/s
250m + x = 2x
250m = x
t=s1/v1= 250m/(2,5m/s)=100s