As given by the question
there are given that the one car travels 5 mi/h faster than other cars.
Now,
Let one car travel at x mph, the other car travels

Then,
Their combined speed is:

Now,
distance is 230
So,

Then,
The other car travels at:

So, the first car travel is 55mi/h and another car is 60 mi/h.
Hence, the correct option is B.