Diana has walked '8" "km//h' in 4 hours. Now she plans to run at speed of '8" "km//h' . how long she needs to run at that speed so that her average speed during the whole trip would be '8" "km'
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युक्लिड के अनुसार एक ठोस की कितनी विमाएँ होती हैं?*
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