1. The times when the the water has a depth of 14 m are

an

2. Since you are allowed to use a TI83 and since the number format of hours-minutes-seconds is similar to the number format of degrees-minutes-seconds you can use the build-in function DMS:

- type the result and press enter

- then use 2ND ANGLE 4 = DMS and type enter

- interpret the result as 5 o'clock and 17 minutes and 11.2 seconds

- see attachment