From the attached graph, we can see that:
Xena's velocity is equal to 8 m/sec
velocity = distance / time
Therefore,
time = distance / velocity
We want the distance to be 60 m and we have the velocity = 8 m/sec
substitute in the equation to get the time as follows:
time = 60/8 = 7.5 seconds
This means that Xena would need 7.5 seconds to catch Gabriele
