You made a little mistake... Why would you multiply the speed by the respective distances?

If you multiply speed by distance, you get... well... it's nothing measurable really.. You have to divide the distance by the speed to obtain the time it takes to reach certain places. From there you can easily derive the distances. So try dividing instead of multiplying.

I tried to solve it again and succesfully obtained the same answer as I had obtained the first time I tested it. Good Luck if you're still interested :P