book Maths Puzzle Numerical Ability

Hello - Could a tutor please help me with the below problem. I don't even know where to start! In advance, thanks for your assistance!

Write the partial fraction decompositi

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Two hot dogs and one hamburger cost $3.39. Three hot dogs and three hamburgers cost $6.57. What is the cost of one hot dog? A supersonic airplane flies 4 hours from London to New York. At the same time, a subsonic plane flies 8 hours from New York to London. How long will it take for the two planes to c