Best Answer

Convert 20 minutes into seconds (20 * 60). There are sixty seconds in a minute. This would make 1200 seconds. Then add the 45 seconds (1245). Convert 30 minutes (1/2 an hour) into seconds (30 * 60). Then subtract 1245 from 1800. This would leave 555 seconds or 9 minutes, 15 seconds. I hope this helps.

Q: How do you subtract 20 mins. 45 seconds from one half hour?

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There are 60 seconds in a min. and 60 mins. in an hour = 3600 seconds in an hour. 19 seconds is therefore 19/3600 of and hour.

No.

3 mins and 54 secs

1 hr and 25 minutes is 5100 seconds.

29 mins, because at 30 mins it will have doubled the amount at 29 mins, making 29 mins halfway. it is NOT 30 mins!!

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1 hour = 60 minutes therefore 60 mins + 42 mins = 102 mins 102 mins x 60 seconds = 6120 seconds 6120 seconds

There are 60 seconds in a minuet and 60 minutes in an hour. Therefore one hour and 30 mins. is the same as 90 mins. 60*90= 5400 seconds.

150 seconds

There are 60 seconds in a min. and 60 mins. in an hour = 3600 seconds in an hour. 19 seconds is therefore 19/3600 of and hour.

7,440 seconds.

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60 secs x 60 mins = 3600 seconds in an hour :D

90 seconds

No.

77 × 60 = 4620 seconds

180 mins

1600 (seconds) / 60 (seconds /min) = 26 mins 40 seconds 26.67 mins = 60 (minutes/hour) = .44 hours