In the 2004 summer olympics, marie helene premont won the silver medal in the women's mountain bike race. she completed the 31.3 km course in 1 h 57 min 50 s.
a) determine her average speed in kilometres per hour.
b) at this rate, how long would she take to complete a course of 45 km? express your answer in hours, minutes, and seconds.
show the steps.

Mariah is randomly choosing three books to read from the following: 5 mysteries, 7 biographies, and 8 science fiction novels. which of these statements are true? check all that apply. there are 20c3 possible ways to choose three books to read. there are 5c3 possible ways to choose three mysteries to read. there are 15c3 possible ways to choose three books that are not all mysteries. the probability that mariah will choose 3 mysteries can be expressed as . the probability that mariah will not choose all mysteries can be expressed as 1 −