Answer:
1800km
Explanation:
This question will be answered using the attached S-wave graph.
The graph is plotted as time (y axis) against distance (x axis).
So, when
y = 6 minutes 40 seconds
x = 1.8 * 10³ km
So, we have:
x = 1.8 * 1000km
x = 1800km
C
