Please help me!!! i will give brainliest! please answer part A and B (links=report)

What number produces an irrational number when multiplied by -1.25

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?

The area of a circle is equal to 1 dm². find the radius of the circle.