A boy runs for 20 min at a uniform speed of 18kmph. At what speed should he run for the next 40 min so that the average speed comes 24kmph
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Suppose the two photographs, shown in fig. 13.1 and fig. 13.2 of NCERT had been taken at an interval of 10 seconds. If a distance of 100 metres is shown by 1 cm in these photographs, calculate the speed of the blue car.
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