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
<pre>Correct answer: {{{highlight_green(matrix(1,8, 2/3, "hour,", or, 40, "minutes,", or, CHOICE, E))}}}
IGNORE all other NONSENSICAL answers!