How many heartbeats can a person feel in 15 seconds?

5400 sec. in 1.5 hrs.

15 * 60 * 60 = 54,000 seconds

1 minute = 60 seconds 1 hour = 60 minutes 1 day = 24 hours 1 year = 365.25 days 15 years = (15 x 365.25 x 24 x 60 x 60) = 473,364,000 seconds

1 minute = 60 seconds 15 minutes = 15 x 60 = 900 seconds