Posted by john on Sunday, November 21, 2010 at 11:14pm.
Solve for v1.
O.500km/v1+3.50km/2v1=0.250h

physics  drwls, Monday, November 22, 2010 at 12:46am
(2.25 km)/v1 = 0.25 h
v1 = 9 km/h
h would have to have dimensions of time for this to make any sense. I assume the "h" means hours in this case

physics  John, Monday, November 22, 2010 at 12:58am
How did you get 2.25/v1?

physics  drwls, Monday, November 22, 2010 at 1:02am
I did the algebra, combining the two terms on the left.
3.50km/(2v1) = 1.75km/v1
Add 0.50km/v1 to that

physics  John, Monday, November 22, 2010 at 1:07am
Thanks I don't know I could forget that. Is this like algebra?

physics  drwls, Monday, November 22, 2010 at 6:54am
Yes. You need to do some algebra to get the answer. You don't need any physics.
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