Posted by **Dakota** on Tuesday, August 28, 2012 at 6:38pm.

It takes a runner 3 h, 28 min, 33 s to run a marathon. If the distance of a marathon is 42.2 km, what is the average speed of the runner?

- Physics -
**bobpursley**, Tuesday, August 28, 2012 at 7:00pm
28 min=28/60 of a hour

33 sec=33/3600 of an hour.

add these to 3hr.

avg speed=42200m/timeabove

- Physics -
**Dakota**, Tuesday, August 28, 2012 at 7:53pm
Runner A is initially 2.4 km west of a flagpole and is running with a constant velocity of 7.2 km/h due east. Runner B is initially 8.6 km east of the flagpole and is running with a constant velocity of 7.6 km/h due west. What will be the distance of the two runners from the flagpole when their paths cross?

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