IBPS PO Prelims practice question
Three cyclists start together from the same point on a circular track of length 4 km and ride in the same direction at 20 km/h, 15 km/h and 12 km/h respectively. After how much time will all three of them be at the starting point together again for the first time?
From a IBPS PO Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 4 hours
Time for one round: first = 4/20 = 0.2 h = 12 min; second = 4/15 h = 16 min; third = 4/12 h = 20 min. All three meet at the start together after LCM(12, 16, 20) = 240 minutes = 4 hours.
हिंदी में प्रश्न
तीन साइकिल चालक एक 4 किमी लंबे गोलाकार ट्रैक पर एक ही बिंदु से एक साथ शुरू होकर एक ही दिशा में क्रमशः 20 किमी/घंटा, 15 किमी/घंटा और 12 किमी/घंटा की चाल से चलते हैं। तीनों पहली बार दोबारा प्रारंभिक बिंदु पर एक साथ कब होंगे?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 4 घंटे
एक चक्कर का समय: पहला = 4/20 = 0.2 घंटे = 12 मिनट; दूसरा = 4/15 घंटे = 16 मिनट; तीसरा = 4/12 घंटे = 20 मिनट। तीनों LCM(12, 16, 20) = 240 मिनट = 4 घंटे बाद प्रारंभिक बिंदु पर दोबारा एक साथ होंगे।
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