RRB Technician Grade 3 practice question
In a 400 m race, A can give B a start of 80 m and C a start of 120 m. How much start can B give C in a 320 m race?
From a RRB Technician Grade 3 Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (C) 40 m
While A runs 400 m, B runs 320 m and C runs 280 m. So B : C = 320 : 280; when B runs 320 m, C runs 320 × 280/320 = 280 m. Start B can give C = 320 − 280 = 40 m. (The bare difference 120 − 80 = 40 m is the trap; it is only right when the race is 320 m long.)
हिंदी में प्रश्न
400 मी की एक दौड़ में A, B को 80 मी और C को 120 मी की बढ़त दे सकता है। 320 मी की दौड़ में B, C को कितनी बढ़त दे सकता है?
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सही उत्तर: (C) 40 मी
जब A 400 मी दौड़ता है, B 320 मी और C 280 मी दौड़ता है। अतः B : C = 320 : 280; जब B 320 मी दौड़ता है, C 320 × 280/320 = 280 मी दौड़ता है। B द्वारा C को दी जा सकने वाली बढ़त = 320 − 280 = 40 मी। (केवल अंतर 120 − 80 = 40 मी लेना जाल है; यह तभी सही है जब दौड़ 320 मी की हो।)
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