Two cyclists begin training on an oval racecourse at the same time. The professional cyclist completes each lap in 4 minutes; the novice takes 5 minutes to complete each lap.How many minutes after the start will both cyclists pass at the same spot where they began to cycle?
a ..10 b.. 8 c..14 d….12

Question

Two cyclists begin training on an oval racecourse at the same time. The professional cyclist completes each lap in 4 minutes; the novice takes 5 minutes to complete each lap.How many minutes after the start will both cyclists pass at the same spot where they began to cycle?
a ..10      b.. 8          c..14       d….12

anonymous · Answer

I believe the options are wrong. Answer is 20 minutes. By then the pro guy will have done 5 laps and the novice guy 4.

anonymous · Answer

the lcm will be 5*4=20 min