SOLUTION: Ann has walked 8 km with a velocity of 4 km/h. Now she will jog for some time with a velocity of 8 km/h. How long does she have to jog in order to have an overall average velocity

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Question 1070375: Ann has walked 8 km with a velocity of 4 km/h. Now she will jog for some time with a velocity of
8 km/h. How long does she have to jog in order to have an overall average velocity of 5 km/h?
(A) 15 min (B) 20 min (C) 30 min (D) 35 min (E) 40 min
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39616)   (Show Source): You can put this solution on YOUR website!
            
            SPEED     TIME      DISTANCE

WALK         4               8

JOG          8         t         8t

Totals              t+2        8t+8


Question asks for overall speed to be 5 kilometer per hour.





, forty minutes.



-----------removed incorrect steps and results-----------

Answer by MathTherapy(10551)   (Show Source): You can put this solution on YOUR website!

Ann has walked 8 km with a velocity of 4 km/h. Now she will jog for some time with a velocity of
8 km/h. How long does she have to jog in order to have an overall average velocity of 5 km/h?
(A) 15 min (B) 20 min (C) 30 min (D) 35 min (E) 40 min
Correct answer: 

IGNORE all other NONSENSICAL answers! 

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