AP Police Constable practice question
A motorist travels for some time at 35 km/h and then for the rest of a total journey time of 8 hours at 55 km/h, covering a total distance of 380 km. For how long did he travel at 35 km/h?
From a AP Police Constable Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (C) 3 hours
Let time at 35 km/h be t hours; remaining time is (8 − t) hours at 55 km/h. Total distance: 35t + 55(8 − t) = 380. This gives 35t + 440 − 55t = 380 → t(35−55) = 380 − 440 → -20t = -60 → t = 3 hours.
हिंदी में प्रश्न
एक मोटर चालक कुल 8 घंटे की यात्रा में कुछ समय तक 35 किमी/घंटा की चाल से और शेष समय 55 किमी/घंटा की चाल से चलता है, और कुल 380 किमी दूरी तय करता है। वह 35 किमी/घंटा की चाल से कितने समय तक चला?
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सही उत्तर: (C) 3 घंटे
माना 35 किमी/घंटा की चाल से चलने का समय t घंटे है; शेष समय (8 − t) घंटे 55 किमी/घंटा पर है। कुल दूरी: 35t + 55(8 − t) = 380. इससे 35t + 440 − 55t = 380 → t(35−55) = 380 − 440 → -20t = -60 → t = 3 घंटे।
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