How do I make a game object spawn several times in semi-random locations?

I am making a racing game where bombs drop from the sky and explode upon hitting the ground. I want to make the bombs drop from the sky in random positions ALONG the track (so there aren't random bombs being dropped outside of the play area) and I want this to continue until the race is over. How could I go about doing this? I am not good at coding so specific instructions would be GREATLY APPRECIATED. Thank you so much!