A byclist was going from point A to point B at a speed of 12km per hour. On the way back he increased his speed by 18km and covered the distance in 15 minutes less. what is the distance between point A and point B

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If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

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.