SSC CGL – Combined Graduate Level Examination · প্রশ্ন 65
Three runners on a 2.5 km circular track start at the same point with speeds 8, 10 and 12 km/h. From 9 am to 3 pm, how many times do they meet at the start?
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (C) 5 times
ব্যাখ্যা
Lap times 18.75, 15 and 12.5 min have LCM 75 min. In 360 min they meet at 75, 150, 225, 300; the key's 5 also counts the 9 am start.