A train travels from city A to city B with a constant speed of 10 ms−1 and returns back to city A with a constant speed of 20s−1. Find its average speed during its entire journey.

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A train travels from city A to city B with a constant speed of 10 ms−1 and returns back to city A with a constant speed of 20s−1. Find its average speed during its entire journey.
27
Aug
A train travels from city A to city B with a constant speed of 10 ms−1 and returns back to city A with a constant speed of 20s−1. Find its average speed during its entire journey. A train travels from city A to city B with a constant speed of 10 ms−1 and returns back [...]
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