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if you walk 1.5 hours at 3mph, how fast shoukd you run in the next 0.5 hours to have the average speed of 4mph

 Mar 27, 2021
 #1
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+2

1.5 hr * 3 m/hr = 4.5 miles

 

(4.5  m  +  .5 hr * x m/hr ) / ( 1.5+ .5 hr)   =  4 m/hr

 

 4 .5 + .5x   = 4 ( 2)

.5x = 3.5

x = 7 m/hr

 Mar 27, 2021
 #3
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Nice job!

wolfiechan  Mar 27, 2021
 #2
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d=4*2   (1.5+0.5)

d=8 miles

8-4.5=3.5 miles to run in 0.5 hours

3.5=R*0.5

R=3.5/0.5=7 mph

So your answer is 7mph!

-wolfie ^-^

 Mar 27, 2021

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