rules
If checking luggage, it must be checked by 3:00 PM.
Anyone arriving at the gate after 3:30 PM must have checked in online before 3:30 PM.
No one can board after 3:50PM
Did Mateo reach the gate later than Zahra?
Statement 1
Zahra was allowed to board but Mateo was not
Zahra arrives at 3:40pm, had checked in online-boards.
Mateo arrives at 3:31pm had not checked in online-cannot board.
Here Mateo arrived earlier
Zahra arrives at 3:20 pm-boards.
Mateo arrives at 3:45 without online check-in - cannot board
since we get both yes and no it's Not sufficient.
Statement 2
only one traveler needed to check the luggage, doing so at 2:45 pm and only one checked in online before 3:30 pm.
This does not fix the gate arrival time.
Mateo could have arrived earlier or later than Zahra.
Not sufficient
Statement 1 and 2 together
from statement 2, the luggage drop happened at 2:45pm, this means neither traveler failed the luggage rule.
This means mateo couldn't board solely based on his gate arrival time and online check-in status.
Possibility 1
since zahra boarded without online check-in, she must have arrived at the gate at or before 3:30pm.
mateo had online check-in but still failed to board, he must have arrived after the gate closed at 3:50pm.
Here Mateo arrived later than Zahra.
Possibility 2
Since Mateo did not check in online and failed to board,he must have arrived after 3:30 pm.
zahra checked in online, so she safely boarded anytime upto 3:50pm
Since we get both Yes and No it's Not Sufficient.
ANS: E