RRB Technician Grade 3 previous year question
One pipe can fill the tank in 18 min, while another pipe can empty the completely filled tank in 72 min. If both the pipes are operated together on empty tank, how long (in min) will it take to fill two-third of the tank?
Asked in RRB Technician Grade 3 (09 Mar 2026 Shift 3) · Quantitative Aptitude
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Correct answer: (B) 16
Net filling rate = 1/18−1/72 = 3/72 = 1/24 per minute, so the tank fills fully in 24 minutes; filling two-thirds takes 24×2/3 = 16 minutes.
हिंदी में प्रश्न
एक पाइप किसी टंकी को 18 मिनट में भर सकता है, जबकि दूसरा पाइप पूरी तरह से भरी हुई टंकी को 72 मिनट में खाली कर सकता है। यदि दोनों पाइप को खाली टंकी में एक साथ खोल दिया जाए, तो टंकी का दो-तिहाई भाग भरने में कितना समय (मिनटों में) लगेगा?
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सही उत्तर: (B) 16
शुद्ध भरने की दर = 1/18−1/72 = 3/72 = 1/24 प्रति मिनट, अतः टंकी पूरी तरह 24 मिनट में भरती है; दो-तिहाई भरने में 24×2/3 = 16 मिनट लगेंगे।
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