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For your code, you misinterpret the expected result as the input. The input is given in the form of 2-dimensional array, each having a name and score respectively --> [[name1, score1], [name2, score2]...]. You have to define a list property that can retrieve a list in the form of [name1: score1, name2: score2, ...] sorted based on the given criteria.

You did not consider the way back home in the price and you also calculate the price of a full tank when distance is 0. What if distance is 0 but there is still gas in the tank? ;-)

If you want to console.log before an error occurs yoou should console.log. . . before this error may happen.
I put a line in your code :

for(var i in result)
{
console.log(`result: ${result}, result[i]: ${result[i]}, typeof result[i]:${typeof result[i]}`)  // <-- here is my line !
  result[i].reverse();
  result[i] = result[i].join(' ');
}

. . . and got this log :

 Add (chaining) 2 players
Log
result: Ada: 44,,,Bob,88,Clo,10, result[i]: Ada: 44, typeof result[i]: string

When you try to use .reverse (an array method) on Ada: 44 (a string) an error happens !

Don't give up poor po !

; ) )

PS: nice new nick name !