The city B is 120 miles down the river from city A.
The speed of water flow in the river is 6mph.
How long does it take to sail from A to B in absence of wind?
2007-09-04 05:45:45 · 4 answers · asked by Alexander 6 in Science & Mathematics ➔ Physics
When yacht does not move relative to water it experiences the wind with speed 6mph. So by starting moving upwind yacht can add 1/3*6=2 mph and its total speed relative to the ground will be 8mph. It will take 120/8=15 hours to make a trip.
2007-09-04 05:57:33 · answer #1 · answered by Alexey V 5 · 5⤊ 0⤋
In the absence of wind, you can drift (some might object to calling it sailing) from A to B in 20 hours (120 mi./(6 mi/hr))
2007-09-04 05:55:51 · answer #2 · answered by PoppaJ 5 · 2⤊ 1⤋
Haha PoppaJ
http://answers.yahoo.com/my/profile;_ylt=At_Cdi1f9x1SzpKL5JARhzvsy6IX?show=d589a2f329d80334bad0fe902c8c71f8aa
2007-09-04 06:01:34 · answer #3 · answered by Anonymous · 0⤊ 1⤋
20 hours. No wind, no sailing... you just gotta float down river.
2007-09-04 05:55:49 · answer #4 · answered by Aliursis 2 · 1⤊ 1⤋