Posted by Erica on Sunday, October 12, 2008 at 12:48pm.
This school subject is math.
Erik bicycles 32 km/h with no wind. Against the wind he bikes 33 km in the same time it takes to bike 63 km with the wind. What is the speed of the wind?
You have to assume in this case the wind retards and assists with the same force, which is not usually true.
Vrg=Vrgs+Vwind
where Vrg is net velocity relative to ground, Vrgs is velocity relative to ground in still conditions, and Vwind is the velocity of the wind.
Vrgs=32
33km/time=32km/hr-Speedwind
63km/time=32km/hr+speed wind.
add the equations...
33+63)km/time=64km/hr
then time= 96/64 hr
Now solve for speed of wind in the first equation..
33km/time=32km/hr-speedwind.
Now solve for speed of wind in the first equation..
33km/time=32km/hr-speedwind.
How do I do that?
Related Questions
Math word problem - Erik bicycles 32 km/h with no wind. Against the wind he ...
Algebra 2 - An airplane flies 1050 km with the wind. In the same amount of time...
Algebra 1 - An airplane travels 6200 km against the wind in 8 hours and 7080 km ...
algebra 2 - With the wind, a jet can fly 2500 km in 2 hours and 30 minutes. ...
math - a jet flies with wind at 1100 km/h and against the same wind at 750 km/h....
algebra - A jet flies with the wind at 1100 km/hr and 750 km/hr against the same...
math - A jet takes the same time to travel 2500km with the wind as it does to ...
Algebra - Elena bicycles 6 km/h faster than Dennis. In the same time it takes ...
Algebra: 8th Grade; Equation Check - 1) A private airplane leaves an airport and...
Math - An airplane has a speed of 400 km/h with no wind. The airplane flies 2140...
For Further Reading
