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two waves traveling reach the same destination

wave 1 traveling at 8000m/s

wave 2 traveling at 4500m/s

wave 2 arrives 2 minutes after the first wave

how far did they travel?

v1=d/t1

v2=d/(t1+120)

t1 = d/8000

4500 = d / ((d/8000)+120)

every time i try solve for the awnser manually it's 274m (which is wrong)

and i get the correct awnser from putting it in my graphics calculator and it's 1234285 meters (1.2*10^6 m)

i have no idea how to re arrange it!

4500 * ( (d/8000) + 120 ) = d

4500 * (d/8000) = d-120

4500 * d = (d-120) / (1/8000)

i don't know