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July 28, 2014

July 28, 2014

Posted by **Erica** on Sunday, October 12, 2008 at 12:48pm.

- Help - math -
**Ms. Sue**, Sunday, October 12, 2008 at 12:50pmThis school subject is math.

- Help - Erica, Math -
**GuruBlue**, Sunday, October 12, 2008 at 12:51pmErik 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?

- Help -
**bobpursley**, Sunday, October 12, 2008 at 12:54pmYou 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.

- Help -
**David**, Sunday, October 12, 2008 at 1:11pmNow solve for speed of wind in the first equation..

33km/time=32km/hr-speedwind.

How do I do that?

- Help -

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