two and a half seconds
30 minutes × 60 seconds = 1800 seconds in half an hour.
2 and a half hours is 90 seconds.
There are 5,400 seconds in an hour and a half.
Exactly 30 seconds
Aday in a half
two and a half seconds
There are 5400 seconds in an hour and a half.
30 seconds in half a minute (there are 60 seconds in a minute)
One week = 1,209,600 half-seconds.
30 minutes × 60 seconds = 1800 seconds in half an hour.
There are 19800 seconds in 5 and a half hours.
30 seconds
2 and a half hours is 90 seconds.
There are 5,400 seconds in an hour and a half.
150 seconds
12,600 seconds.