RRB JE practice question
A car travels 120 km at an average speed of 60 km/h and immediately returns along the same route covering the distance in 1.5 hour(s). What is the average speed of the car for the entire journey in m/s?
From a RRB JE Science practice set · Science
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Correct answer: (C) 19.05 m/s
Time for onward journey = 120/60 = 2.00 h. Total distance = 240 km, total time = 2.00+1.5 = 3.50 h. Average speed = 240/3.50 = 68.57 km/h = 19.05 m/s.
हिंदी में प्रश्न
एक कार 120 किमी की दूरी 60 किमी/घंटा की औसत चाल से तय करती है और तुरंत उसी मार्ग से वापस लौटती है तथा यह दूरी 1.5 घंटे में तय करती है। पूरी यात्रा के लिए कार की औसत चाल मी/से में क्या है?
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सही उत्तर: (C) 19.05 m/s
जाने में लगा समय = 120/60 = 2.00 घंटा। कुल दूरी = 240 किमी, कुल समय = 2.00+1.5 = 3.50 घंटा। औसत चाल = 240/3.50 = 68.57 किमी/घंटा = 19.05 मी/से।
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