You gave $30.
[$30 * 0.20] (tip % amount) = $6.
You left $6 in tips.
I believe it is 3.75 miles. 5 2/5=5.4 and 1 11/25=1.44. 5.4/1.44=3.75.
To solve this let our write this fraction in terms.

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So now let change this problem as a multiplication problem. To change this to multiplication problem we have to flip our second term

So, now let's simplify the terms. So we get
Thus this is our final answer.