Biology, 18.12.2020 01:00, brewerroserb
What is the average speed of a train that covers 80 km in 1 hour, 200 km in 2 hours, and 420 km in 4 hours ?
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What is the average speed of a train that covers 80 km in 1 hour, 200 km in 2 hours, and 420 km in 4...
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