I have problem understanding the question 158B-taxi Could someone please help me ?

i was wondering about writing a question here .... as U know ... describing a question here is a little hard ... if there is a matrix in this question its impossible because when you write a matrix here it shows the whole matrix in one line that is confusing really ! so i decided to put this question as a link here ... because U can C it so better . click here to see the question don't remember to comment :)