The average age of 60 boys in a class was calculated as 12 years. It was later realised that the actual age of one of the boys in the class was 12.5 years but it was calculated as 14 years. What is the actual average age of the boys in the class ?
Birju, Bankim and Boney begin to jog around a circular stadium. They complete their revolutions in 36 seconds, 48 seconds and 63 seconds respectively. After how many seconds will they be together at the starting point ?