Mathematics, 31.12.2019 01:31 oomale

Two cities are 2160 miles apart. a plane leaves one of them, traveling towards the other at an average speed of 320 miles per hour. at the same time a plane leaves the other, traveling towards the first, at an average speed of 400 miles per hour. how long will it take them to meet?

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Two cities are 2160 miles apart. a plane leaves one of them, traveling towards the other at an avera...