Answer
The laser burst from pistol 4 hits the target first.
Work Step by Step
In parts (a) to (d), we found the travel time for the laser burst from each pistol:
(1) 42.0 ps
(2 42.3 ps
(3) 43.2 ps
(4) 41.8 ps
We can see that the laser burst from pistol 4 has the least travel time.
Therefore, the laser burst from pistol 4 hits the target first.
