He excercise per week a total of:
[tex]\frac{1}{2}+\frac{3}{4}+\frac{1}{4}=1\frac{1}{2}[/tex]If he sticks to this schedule for 4 weeks he will train a total of:
[tex]4\cdot1\frac{1}{2}=4\cdot\frac{3}{2}=\frac{12}{2}=6[/tex]Therefore he will excercise for a total of 6 hours.
