16km = 16000 m A makes it around the track 10 times (16000/1600) in an hour Similarly B = 15 times and C = 20 times in an hour In 60 minutes, A will complete track once every 6 minutes, B once every 4 minutes and C once every 3 minutes LCM of A,B,C is 12 IXAMBEE APPROACH: Time = Distance/Speed Time for A = 1.6/16 hours Time for B = 1.6/24 hours Time for C = 1.6/32 hours LCM of A,B,C = (LCM of numerator)/(HCF of Denominator) = (LCM of 1.6,1.6,1.6)/(HCF of 16,24,32) = 1.6/8 hours 1.6/8 hours = 12 minutes
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