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Speedy Sidney

Two trains set off at the same time from each end of a single straight railway line. A very fast bee starts off in front of the first train and flies continuously back and forth between the two trains. How far does Sidney fly before he is squashed between the two trains?

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Rule of Three

If it takes four men one day to build a wall, how long does it take 60,000 men to build a similar wall?

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Digital Times

Which segment on a digital clock is lit most each day? Which segment is lit least? Does it make any difference if it is set to 12 hours or 24 hours?

Minutes in Between

Stage: 3 Short Challenge Level: Challenge Level:1

Two complete hours takes you to $13:41$. Then, another 19 minutes takes you to $14:00$, and another 2 minutes to $14:02$.

As there are 60 minutes in an hour, the two hours is the same as 2 x 60 = 120 minutes, so the total time is 120 + 19 + 2 = 141 minutes.

This problem is taken from the UKMT Mathematical Challenges.