book Maths Puzzle Numerical Ability

Kara floats from Barber Park to Eagle Island at 6 km/h.
She returns by motorboat at 18 km/h.
The float trip takes 4 hours longer than the motorboat trip.
How many kilometers is it from Barber Park to Eagle Island?

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book Other Question

When the ancient Egyptians were building the great pyramids at Giza, they checked each cource or level of stones to make sure they were being laid square by measuring the diagonals Write a polynomial function of least degree with integral coefficients whose zeros include 4 and 2i.