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September 18, 2014

September 18, 2014

Posted by **Larry** on Saturday, January 12, 2013 at 5:04pm.

- math -
**noname**, Saturday, January 12, 2013 at 6:16pm>he travels at 30 kilometers per hour for the first 10 kilometers

It takes 10/30 = 1/3 hour = 20 minutes

>at 15 kilometers per hour for the rest of the trip

The rest of the trip = 40-10=30km,

which takes 30/15=2 hours

So, in total the first option takes 2 hours and 20 minutes or 2 1/3 hours.

The second option:

>he travels the entire trip at 20 kilometers per hour

40/20=2 hours

>how many minutes more will it take

2 1/3 - 2 =1/3 hour = 20 minutes

see you at ascii_org_ru

- math -
**Steve**, Saturday, January 12, 2013 at 6:17pmtime = distance/speed

10/30 + 30/15 = 2 1/3

40/20 = 2

so, it takes 1/3 hour (20 minutes) more.

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