The Length of the Second Train



A train moving at a speed of 49 mph is passed by a train moving at a speed 63 mph.

A passenger in the first train noted that the second train took 4.5 seconds to pass
him.

How long is the second train?

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The Driving School



A driving school claims an average test pass rate of 76.8 per cent.

What is the least number of pupils required to achieve this result?

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