MPSC Rajyaseva 2022 CSAT — Question 57
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रिना, टिना आणि हिना यांनी एकाच वेळी एकाच दिशेने एकाच बिंदूपासून वर्तुळाकार क्रीडांगणाभोवती धावायला सुरुवात केली. एक फेरीत रिनाने 70 सेकंदात, टिनेने 105 सेकंदात आणि हिनाने 175 सेकंदात पूर्ण केली. त्या तिघी किती वेळेने पुन्हा प्रारंभिक बिंदूजवळ भेटतील ? Rina, Tina and Hina are starting at the same time from the same point in the same direction to run around the circular playground. Rina completes a round in 70 seconds, Tina in 105 seconds and Hina in 175 seconds. After how much time will they meet again at the starting point ?
Find the LCM of the times taken to complete one round: LCM(70, 105, 175). Prime factors: 70 = 2*5*7, 105 = 3*5*7, 175 = 5*5*7. LCM = 2*3*5*5*7 = 1050 seconds. Convert to minutes: 1050 / 60 = 17.5 minutes = 17 minutes 30 seconds.
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