What is the probability that an approaching truck driver will see more than one truck waiting in line?

The Department of Motor Vehicles $($DMV$)$ uses a Single$-$Server Model for the service counter to renew driver's licenses. The average number of people arriving to renew their license each hour is $10.$ The average service rate is $14$ people per hour.

$4.$ When Maria enters the DMV to renew her license, what is the probability that she won't have to wait to be served?