Answer:
After 40 hours.
Explanation:
Let, after x hours both will charge the same total fees,
The amount charged by Beau = Base fees + the money for x hours
= 10 + 5 x
Similarly the amount charged by Jaime = Base fees + The money for x hours
= 12 + 4.50 x
⇒ 10 + 5x = 12 + 4.50x
⇒ 5x - 4.5x = 12 - 10
⇒ 0.5x = 2
⇒ x = 40
Hence, after 40 hours they will charge the same fee.