SBI Clerk Prelims practice question
A beats B by 45 m or 9 seconds in a race. If B's time to complete the race is 81 seconds, find the length of the race.
From a SBI Clerk Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (D) 405 m
'Beats by 45 m or 9 seconds' means B's speed = 45/9 = 5 m/s. Since B's total time is 81 seconds, the race length = B's speed × B's time = 5 × 81 = 405 m.
हिंदी में प्रश्न
एक दौड़ में A, B को 45 मीटर या 9 सेकंड से हरा देता है। यदि B का दौड़ पूरी करने का समय 81 सेकंड है, तो दौड़ की लंबाई ज्ञात कीजिए।
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सही उत्तर: (D) 405 मीटर
'45 मीटर या 9 सेकंड से हराना' का अर्थ है B की चाल = 45/9 = 5 मी/से। चूँकि B का कुल समय 81 सेकंड है, दौड़ की लंबाई = B की चाल × B का समय = 5 × 81 = 405 मीटर।
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