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Parvathysubhash
An aeroplane leaves an important and flies due north at a speed of 1000 km per hour.At the same time,another aeroplane leaves the same airport and flies due west at a speed of 1200 km per hour.How far apart will be the two planes after 1 1/2 hrs???
draw a x,y plane. now plot the distances they flew in 1/2 hours and use Pythagoras to solve.
|dw:1339874787294:dw| , A distance traveled by plane A , B is distance traveled by plane B and C is distance between them \[C ^{2} = A ^{2} + B ^{2}\] , Ais 1500 km and B is 1800 Km , you can solve for C.