Explain how you can use a clock to find the elapsed time from 10:30 am to 1:15 pm.?

Question

Please don't use a clock. I need it in writing. thank you. its a "write about it" question.

Answer 1

The easiest way is to figure the number of minutes (to get them the same), then figure the number of hours (to get them the same).

For example, you need to move from 10:30 to 11:15...

Mentally move the hand forward from 10:30 to 10:35, then 10:40, then 10:45, etc. You'll see that to get to 11:15 you have to move *9* five minute increments. (9 x 5 minutes = 45 minutes). So now you have made the minutes the same :15 and :15.

Next you need to go from 11:15 to 1:15. You can ignore the minutes now... you should count two spots from 11 to 12 to 1. That's 2 hours.

So your final answer is 2 hours and 45 minutes.

Answer 2

change pm numbers to "military time", i.e, add 12 to the hours.
1:15 pm becomes 13:15
now subtract, using mod(60) arithmetic.

13:15 - 10:30 = 12:75 - 10:30 ('borrowing' 60 minutes from one of the hours and adding to the minutes, since 15<30)
= 2:45

Answer 3

You place the hands of the clock at 10:30AM.You then move the hands toward the 1:15PM position and count in hours then minutes as you go.

Answer 4

Explain how you can use a clock
Please don't use a clock
http://www.timeanddate.com/date/timeduration.html

Answer 5

how can you not use a clock?????????????????????????? .



and what the heck is elapsed time???