Question 1052000
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A motorboat leaves a dock and travels an average speed of 15mph towards an island. The speed on the return is only 10mph. 
If the return trip takes 1 hour longer, how far is the island from the dock?
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<pre>
15t = 10*(t+1).

Solve for t (which is the time at the speed of 15 mph).

After finding t determine the distance as 15*t.
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