एक व्यक्ति 80 किलोमीटर प्रति घंटा की चाल से चलकर किसी दूरी को 12½ घंटे में तय करता है यदि वही दूरी उसे 8½ घंटे में तय करनी हो तो उसे अपनी चाल में कितने किलोमीटर प्रति घंटे की वृद्धि करनी पड़ेगी?
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Speed = 80km/hr
Time taken=12.5 hrs
Speed='x'km/hr
Time taken=8.5hrs
If the time decreases,speed increases to cover the same distance.
Hence,thus is an example of inverse proportion.
Therefore,x =(80×12.5)÷8.5
=117.64km/hr
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