Asked by Chris

2)A motorboat leaves a dock and travels at an average speed of 15mi/h toward an island. The average speed on the return trip is 10mi/h. How far is the island from the harbor if the total trip takes 5h? (HInt-first find the 2 times)
Answered by Reiny
Let the distance be d miles.
so time towards the island = D/15 hrs
time on return trip is D/10 hrs

isn't D/15 + D/10 = 5 ?
can you solve for D ?
Answered by Chris
sorry i forgot to put that it took the whole trip 5hr
Answered by Reiny
No, you didn't forget to put that in
I used it in my equation.

So, what did you get?
Answered by jelizaveta
is it 5 hr
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