You multiply two rational numbers by multiplying numerators and denominators with each other. So, you have

A rational number is a fraction where both numerator and denominator are integers. Since the product of two integers is an integer, the result fraction is also a rational number, because both
and
are integers.
2 x 19.6 = ?
2 x 29.4 = ?
2 x 576.24 = ?
After you find all of those answers, add them up and you'll get your answer. : )
For most of them you can use a fraction simplifier calculator but so far i have b) 21/2 c) 203/2
1:12 + 2:41 + 1:10 = 4 hours 63 mins
5 Hours and 3 Mins