Mathematics, 10.11.2021 01:50 jenna6891
a swallow files at a speed of 50 km/h for 3 hours and then at a speed of 40 km/h for a further 2 hours .find the average speed for the whole journey
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a swallow files at a speed of 50 km/h for 3 hours and then at a speed of 40 km/h for a further 2 hou...
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