book Maths Puzzle Numerical Ability

A boat that can travel 8 miles per hour in still water can travel 15 miles w with the water's current in the same time that it can travel 9 miles against the water's current. What

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The Cape Cod Canal is eleven miles long. A passenger boat goes from here to Boston, via the canal and ocean, in 15 1/3 hrs., while a freighter makes the same trip in 30 hrs. On the I am working on finding distance. However, I cannot figure out how to get an approximate answer from a square root on the calculator. Example:

square root 19 + 2 square root 35