A train l metres long passes a man, running at m km/hr in the same direction in which the train is going, in t seconds. The speed of the train is? [1 mark]
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As it turns out, the ionosphere reflects certain frequencies of radio waves. So the waves bounce between the ground and the ionosphere and make their way around the planet. The composition of the ionosphere at night is different than during the day because of the presence or absence of the sun.
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