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Please help me with this problem

I read physics on my own so this is not a homework !!

Suppose you fire a rifle bullet (1600 m/s) in a shooting gallery and hear the gong on the target ring 0.731 s later.

Taking the speed of sound to be 330 m/s and assuming the bullet travels straight downrange at a constant speed, how far away is the target ?

Here is my work :

Given { (v_1) = 1600 m/s, (v_2) = 330 m/s, t_T = 0.731 }

Find {l}

There is a distance between us and the target ring (l) that the problem asks to find it.

I know that when speed is constant or we know the average speed we can find (l) the distance traveled :

l = t.v

But in the problem we donâ€™t have t_1 ( the time taken by bullet to reach the target ) and we don't have t_2 ( the time taken by sound to reach our ear ) then we must have v_T (The average speed in from firing the bullet till reaching the sound to our ears ) but to finding that we need to know l_T ( the total distance traveled ) so what shall we do ?

Thanks

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