What is the audible range of human hearing

If jill was traveling at 300 miles in 4 hours due south what was his velocity in miles per minute a) 75 miles per hour due south b) .02 miles per second due south c) .5 miles per second due south d) 1 mile per hour due south

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.