<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def ComputeLightTravelTime(Det1Pos, Det2Pos):
 """ ComputeLightTravelTime - function to compute light travel time between 	two GW detectors at positions Det1Pos and Det2Pos. 	Det1Pos - (3,) array. Position vector of detector 1. 	Det2Pos - (3,) array. Position vector of detector 2. 	Returns travelTime - Light travel time between two GW detectors at 			 positions Det1Pos and Det2Pos [s]. Sarah Gossan 2012. Adapted from TimeDelay.c, written by Jolien 	Creighton, David Chin, Steven Fairhurst, Kipp Cannon, Alexander Dietz, 	Drew Keppel 2007."""


    # Get relative position vector
    Det21Pos = Det2Pos - Det1Pos
  
    # Dot difference vector into itself to get magnitude of detector separation
    dist = np.sqrt(np.dot(Det21Pos,Det21Pos))

    # Normalise with speed of light
    travelTime = dist/c

    return travelTime