exam Maths Puzzle Numerical Ability

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.

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In July 1985 Steve Cram of Great Brotian set a world record of 3 minutes 29.67 seconds for the 1500 meter race and a world record of 3 minutes 46.31 seconds for the 1 mile race (Th 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?