Seconds into hour minute second

According to the "HP 32SII RPN Scientific Calculator Owner's Manual" (at the link below), you just need to treat degrees, minutes, and seconds conversions as hours, minutes, and seconds. Use the left-shift and right-shift keys together with the 5 key to convert to decimal-fraction form (D.d format) and to minutes-seconds form (DD.MMSSss), respectively.

http://www.hp.com/ctg/Manual/bpia5305.pdf
See pages 4-9 and 4-10.

Use the DMS key marked degree, apostrophe, double quotation mark.
Lets us call it [DMS]
To enter an angle in degree minutes seconds or hour, minutes, seconds, type in the number of degrees, press the [DMS] key, enter the number of seconds, press the [DMS] key, enter the number of seconds then the [DMS] key. Press = the calculator displays the value in DMS units. If you press the DMS key again the number displayed is converted to decimal degrees.
Example:enter 12 degrees, 15 minutes, and 25 seconds
12 [DMS]15[DMS]25[DMS] =
Calculator displays 12 deg 15'25"
Press the DMS key again and you see 12.2569444

Press the DMS button to convert between decimal degrees and degrees-minutes-seconds.
The DMS button is marked with the degree, minute, and second symbols. It's located above the [ENG] key, which is located above the [8] key.
For full details, start with the "Degree, Minute, Second (Sexagesimal) Calculations" section beginning on page E-22 of the manual. If you need a manual, you may download a copy here.

There are 1000 meters in a kilometer and 3600 seconds in an hour (60 seconds per minute, 60 minutes per hour).

Press 8 0 0 / 5 0 * 3 6 0 0 / 1 0 0 0 =
or 8 0 0 / 1 0 0 0 * 3 6 0 0 / 5 0 =

The result should be 57.6 kph.

Yes. Pressing the DMS key (two keys above the 8 key) when a result is displayed toggles the result between decimal degrees and degrees-minutes-seconds.

For example, to convert 3.5 degrees, press 3 . 5 = and you'll see 3.5. Now press DMS and you'll see 3 degrees 30 minutes 0 seconds.

Seconds: Subtract 12 from 35 to get 23.
Minutes: Subtract 23 from 45 to get 22
Hours: Subtract 0 from 2 to get 2.

Put the three together to get 2.22.23

This one was easy because there was no need for carry. If you do have to carry, just make sure you carry 60. Otherwise, it's exactly the same as when you learned subtraction in second grade.

Some calculators have conversions between decimal degrees/hours and degrees/hours:minutes:seconds. If you have such a calculator, you can convert both numbers to decimal, subtract, and convert back. Since you didn't specify what calculator you have, I can't tell whether this is an option for you.

To convert a decimal degree value to degree-minute-second, press the o'" key just above the ENG key.

Use the key above the ENG key to enter a value in DMS form, ending each portion with the key. To convert it to decimal, press SD once (or twice if you get a fraction the first time).

Example: sine of 12 degrees 15 minutes:
sin 12 *** 15 *** =
where *** is the DMS key.

Since there are by definition 100 cm in a meter, the distance is 50x100 or 5000 cm. At 1cm/s it takes the ant 5000 seconds to cover the distance. There are 60 seconds in a minute, so it takes 83 minutes and 20 seconds.

Hi,
Here is instruction from the user's manual. the manual link is below, for downloading:

TIME CALCULATION KEY:
• Utilise this key to enter hours and minutes in time
calculations.
• Press this key after entering an hour or minute value.
(There is no need to press this key when entering a second
value.)
• To bypass hour entry, press this key after entering 0.
• To bypass minute entry, you may press this key alone, or
press it after entering 0.
• When this key is pressed, if the preceding entry is in any of
the following ranges, it is set as an hour or minute value:
Hour: Within 6 digits
Minute: 0 to 99 (An entry above 60 is rounded up to one
hour. If a value of more than 3 digits is entered,
only the least significant two digits take effect.)
• A second value is set when it is entered in the following
range:
Second: 0 to 99 (An entry above 60 is rounded up to one
minute. If a value of more than 3 digits is
entered, only the least significant two digits take
effect.)

http://www.sharpusa.com/files/cal_man_EL1197PIII.pdf