I need maths help?
When Don is in the middle of the lake swimming towards the south shore, Dawn jumps in from the north shore and swims after him. When Don is 12 yards from the north shore, Dawn is 42 yards behind him and 90 yards from the north shore. IF they each continue swimming at their same rate, when Don reaches the south shore Dawn will be_________yards from the south shore. show your work.
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