How many groups of 5 min are in a hour?

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

Three coins are flipped. what is the probability that there will be at least two tails?

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.