A vehicle covered a distance with a constant speed. Had its speed been 6 km/hr more, the time elapsed in the journey would have been 4 hours less; had its…एक गाड़ी किसी दूरी को एक नियत चाल से तय करती है। यदि उसकी चाल 6 कि॰मी॰/घण्टा अधिक होती, तो यात्रा में 4 घण्टे कम लगते; यदि उसकी चाल 6 कि॰मी॰/घण्टा कम होती,…
A vehicle covered a distance with a constant speed. Had its speed been 6 km/hr more, the time elapsed in the journey would have been 4 hours less; had its speed been 6 km/hr less, the time elapsed in the journey would have been 6 hours more. The distance is
एक गाड़ी किसी दूरी को एक नियत चाल से तय करती है। यदि उसकी चाल 6 कि॰मी॰/घण्टा अधिक होती, तो यात्रा में 4 घण्टे कम लगते; यदि उसकी चाल 6 कि॰मी॰/घण्टा कम होती, तो यात्रा में 6 घण्टे अधिक लगते। दूरी है
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Correct answer: (C) 720 km720 कि॰ मी॰
Explanation
Let distance d, speed v: d = (v+6)(t-4) = (v-6)(t+6) with d = vt. Solving gives v = 30, t = 24, so d = 720 km.दूरी d, चाल v और समय t लें: d = vt = (v+6)(t-4) = (v-6)(t+6)। हल करने पर v = 30, t = 24, अतः d = 720 कि॰मी॰।