At 2:30 p.m. during a long drive, Bobbi asks her parents, ``Are we there yet?'' Her mother responds, ``We will be there in 7200 seconds.'' If Bobbi's mother is correct, at what time in the afternoon will they arrive at their destination?
Multiply 7200 seconds by $\left(\frac{1\text{ min.}}{60\text{ sec.}}\right)\left(\frac{1\text{ hr.}}{60\text{ min.}}\right)$ to find that they will arrive in 2 hours.  Two hours after 2:30 p.m. is $\boxed{\text{4:30 p.m.}}$.