Judging by the sketch, H is the vertical distance and D is the horizontal distance between where the bullet is shot and where it gets lodged in the wall. Let v₀ = 374 m/s, h = 0.45 m, and d = 9.6 m.
At time t, the bullet has
• horizontal position

• vertical position

Let t₁ and t₂ be the times when the bullet reaches the window and the wall, respectively. We want to find H and D given that

Eliminate D and H to get a system of equations involving t₁ and t₂ :


The first of these equations says

and substituting into the second equation gives

Solve for t₁ :


Solve for t₂ :

Now solve for H and D :







