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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.
PLEASE SHOW THE STEPS.

Respuesta :

I think
A. convert the time to seconds, so all the time are 7070sec and the total course to meter.
so 31300meter
Vector = TotalCourse÷total time
V=31300/7070=4.427157m/s
convert it to km/h so 4.427157×36÷10=
15.9377km/h
B. 45÷15.9377=2.823Hour
it means that around 2 Hour 48Minutes more.
i think the teacher need to simplify it

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