Posted by Larry on Saturday, January 12, 2013 at 5:04pm.
Phil is making a 40kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes more will it take him then if he travels the entire trip at 20 kilometers per hour?

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 = 4010=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 6:17pm
time = distance/speed
10/30 + 30/15 = 2 1/3
40/20 = 2
so, it takes 1/3 hour (20 minutes) more.
Answer This Question
Related Questions
 math  Phil is making a 40kilometer canoe trip. If he travels at 30 kilometers ...
 math  Phil is making a 40kilometer canoe trip. If he travels at 30 kilometers ...
 math  Phil is making a 40kilometer canoe trip. If he travels at 30 kilometers ...
 MATH  Andrea made a car trip of 440 Kilometers. She averaged 54 Kilometers per ...
 math  Andrea made a car trip of 440 Kilometers. She averaged 54 Kilometers per ...
 Math/Algebra  Delivery company charges $10 plus 40ยข per kilometer or part of a ...
 Math  a woman drives to work and averages 70 kilometers per hour for the trip. ...
 Math  Two airplanes leave St. Louis at the same time and fly in opposite ...
 Math  Two airplanes leave St. Louis at the same time and fly in opposite ...
 math  two horses gallop off in the sam direction. Trigger travels25 kilometers ...
More Related Questions