exam Maths Puzzle Numerical Ability

If a freight train and an express train leave town 390km apart, traveling towards one another. The freight train travels 30km slower than the express train they pass one another 3hours later. What are their speeds?

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exam Other Question

in a burger chain, customers who use mustard are 80% customers whwo use ketchup are 65% what is the probability that customers comming in the burger shop will use mustard, ketchup or both? Theresa sold three different magazine subscribtions for $28,$18,and $27. She sold three fewer of the $28 subscriptions than of the $18 subscriptions and a total of 34 subscriptions. If her total sales wer $819, how many $27 subscriptions did Theresa sell?