Posted by Larry on Saturday, January 12, 2013 at 5:04pm.
>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
time = 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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