exam Maths Puzzle Numerical Ability

I have a rectangular swimming pool that is 3 times as long as it is wide. Around the pool is a deck that is 2.5 meters wide and the area of the deck is 265 meters^2. How do I figure out the dimensions of the pool?

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exam Other Question

Two planes are 2100 miles apart and traveling towards each other. One plane is traveling 80 mi/hr. faster than the other plane. The planes meet in 2.5 hr. Find the speed of the slower plane. once again i had to write in the simplest form without negative exponents. my probelm was 10^-3 and i got 1/(over) 10^3 = 1/(over) 100 is this right??