Final answer:
The mechanic charged one customer $125 for 3 hours' worth of work, and another customer $265. The total charge for both customers is $265.
Step-by-step explanation:
The mechanic charged one customer $125 for 3 hours' worth of work, and another customer $265 for an unspecified number of hours. To find the total charge, we need to add up the labor costs for both customers.
Let's assume the labor cost for the second customer is x dollars.
Thus, the total charge is $125 + x = $265. We can solve for x by subtracting $125 from both sides, giving x = $265 - $125 = $140.
Therefore, the mechanic's total charge for both customers is $125 + $140 = $265.