How should I handle my debt?

I currently have $80k in debt.

$40k in Student loans ($35k 4.375%) ($5K 5.00%)

– Roughly $280 a month

$25k Army Career Starter Loan through NFCU (2.99%)

– $370 a month

$14k Used auto loan through NFCU (5.49%)

– $300 a month

So total around $950 a month will be going towards loans.

Typically I would put extra $50 towards each but someone said that the extra $50 I put towards each should just go into one to pay one loan off faster and pay the minimum on the others until one loan is fully paid off. So instead just pay an extra $150 towards one and the minimum on the rest. What do you guys think is the best way to handle this debt?