A train started its journey at 9:00. Its average speed between 9:00 and 13:00 was 80 km/h. It travelled 1/5 of its journey by
13:00. If the train was required to arrive at the destination at
21:00, what average speed must the train travel at for the rest
of the journey?

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In positive numbers less than 1, the zeros between the decimal point and non zero are significant

Gunpowder residue is most likely to show up where on a shooters hands