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suppose you run 5 miles from your house to a friends house at a speed of 7 miles per hour. when the time comes to return home, you are tired and walk the sam 5 miles home at 3 miles per hour. complete parts a through d below

suppose you run 5 miles from your house to a friends house at a speed of 7 miles per hour when the time comes to return home you are tired and walk the sam 5 mi class=

Respuesta :

a-

[tex]Time=\frac{Distance}{Speed} =\frac{5}{7} = 0.7 hour[/tex]


b-

[tex]Time=\frac{Distance}{Speed} =\frac{5}{3} = 1.7hour[/tex]


c-

Correct answer = A- No, because less time is spent travelling 7 miles per hour


d-

[tex]Average \ speed = \frac{2ab}{(a+b)}[/tex]

a= Speed at which you run from your house to your friends house = 7 mph

b= Speed at which you walk from your friends house to your house = 3 mph

[tex]Average \ speed = \frac{(2)(7)(3)}{7+3} = \frac{42}{10} = 4.2 mph[/tex]



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