Racing track

On the racing track circling three cars. The first pass one circuit for 19 seconds, the second for 12 seconds, and a third for 9 seconds.

a) Calculate the number of seconds since starting to catch all three cars together for the first time again across the start line?

b) How many laps ran each car until caught all three cars together for the first time?

Correct answer:

x =  684 s
n1 =  36
n2 =  57
n3 =  76

Step-by-step explanation:

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