**Answer:** Ashley crossed first.

They crossed in the following order (first is on the right):

Alex, Sam, Quinn, Riley, Chris, Blake, Logan, Taylor, Emery, Jessie, Ray, Ashley.

Starting with Clue 2, we can place Ray, Emery, Logan and Riley as follows:

Riley, -, -, Logan, -, Emery, -, Ray, -

Clue 6 tells us that Taylor got on just after Emery, giving us:

Riley, -, -, Logan, Taylor, Emery, -, Ray, -

Clue 5 tells us that Jessie got on two people before Taylor, giving us:

Riley, -, -, Logan, Taylor, Emery, Jessie, Ray, -

By Clue 1, Chris got on two people after Logan, giving us:

Riley, Chris, -, Logan, Taylor, Emery, Jessie, Ray, -

And Clue 1 also tells us about Sam, giving:

Sam, -, Riley, Chris, -, Logan, Taylor, Emery, Jessie, Ray, -

We now have a line of 11 people, the missing person is either in front of Ray, or behind Sam.

The only way to place Alex, Quinn and Blake using Clue 3 and Clue 4 is if the missing person is behind Sam giving:

-, Sam, -, Riley, Chris, -, Logan, Taylor, Emery, Jessie, Ray, -

And therefore we can now place Alex, Quinn and Blake as follows:

Alex, Sam, Quinn, Riley, Chris, Blake, Logan, Taylor, Emery, Jessie, Ray, -

But who crossed first?

The only person we've not yet found a space for is Ashley. So Ashley crossed first.

Alex, Sam, Quinn, Riley, Chris, Blake, Logan, Taylor, Emery, Jessie, Ray, Ashley.