<PRE><B>Question 1199935</B>
A man jogs for 20 minutes at a rate of 6kph, then walks for 30 minutes at a rate of 3 kph, then sits and rests for 15 minutes and finally walks for 45 minutes.
 Find the rule of the function that expresses his distance travelled as a function of time (in hours). 
:
20 min is 1/3 hr
30 min is 1/2 hr
15 min is 1/4 hr
45 min is 3/4 hr
:
Dist = speed * time
{{{d = 6(1/3) + 3(1/2) + 0(1/4) + 3(3/4)}}}
d = 2 + 1.5 + 0 + 2.25
d = 5.75 mi</PRE>