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Posted by **Da S** on Monday, March 26, 2012 at 9:37am.

- Math -
**Reiny**, Monday, March 26, 2012 at 10:07amfirst part -- 3 km = 3000 m

time for 1st part = 3000/(150) = 20 minutes

second part --- 3 km

time for second part = 30-20 = 10 minutes

speed for 2nd part = 3000/10 = 300 m/min

Her speed for the second leg of the trip was 300 m/min

- Math -
**A.P.**, Monday, March 26, 2012 at 10:11am1km = 1000m

She covered the first 3000 meters in 3000/150 = 20 minutes.

Since she covered the remaining 3000 meters in 30-20=10 minutes, she must have cycled at 300m/min on average through this stage.

Average speed is distance divided by time.

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