90 seconds
9,000 seconds.
There are: 90*60 = 5,400 seconds
two and a half seconds
3.5 minutes is 210 seconds.
One week = 1,209,600 half-seconds.
90 seconds
9,000 seconds.
There are: 90*60 = 5,400 seconds
two and a half seconds
60 seconds an 1 minute 60 minutes in 1 hour 30 minutes in half an hour 90 minutes in one and a half hours. So 90 minutes * 60 seconds = 5400 seconds
There are 5400 seconds in an hour and a half.
90 seconds
30 seconds in half a minute (there are 60 seconds in a minute)
30 minutes × 60 seconds = 1800 seconds in half an hour.
There are 19800 seconds in 5 and a half hours.
30 seconds