Answer: 5[tex]\frac{1}{4}[/tex] hrs
Explanation:
Jasper: [tex]\frac{1}{7}[/tex] per hr
Yolanda: [tex]\frac{1}{x}[/tex] per hr
Together: [tex]\frac{1}{3}[/tex] per hr
Jasper + Yolanda = Together
[tex]\frac{1}{7}[/tex] + [tex]\frac{1}{x}[/tex] = [tex]\frac{1}{3}[/tex]
[tex](21x)\frac{1}{7}[/tex] + [tex](21x)\frac{1}{x}[/tex] = [tex](21x)\frac{1}{3}[/tex]
3x + 21 = 7x
21 = 4x
[tex]\frac{21}{4}[/tex] = x
[tex]5\frac{1}{4}[/tex]
