15x60
Well, isn't that a happy little math problem! When you multiply 15 by 60, you get 900. That's a big number, just like a big fluffy cloud in the sky. Keep up the good work, my friend, you're doing great!
there are 60 seconds in one minute; 3600 seconds in one hour at 1 hr 15 minutes that is 3600 + 15x60 = 4500 seconds