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## Homework Statement

An observer in frame S standing at the origin observes two flashes of colored light separated spatially by Δx = 2300 m. A blue flash occurs first, followed by a red flash 5 µs later. An observer in S ' moving along the x axis at speed v relative to S also observes the flashes 5 µs apart and with a separation of 2300 m, but the red flash is observed first. Find the magnitude and direction of v.

## Homework Equations

I believe the necessary equation is v = Δx/Δt

## The Attempt at a Solution

So I initially thought I would simply have to plug in to the above equation Δx = 2300 m and Δt = 5 μs. But now I am realizing that would not give me the velocity of the observer.

To find the velocity of the observer would I have to know the distance he traveled?

And then use Δt = 5x10^-6?