3*3 + 1 = 10 trains every 20 minutes from 6 am to 9 am inclusively

    PLUS

2*7 = 14 trains every 30 minutes from 9:30 am to 4 pm inclusively.



10 + 14 = 24 trains, in total.



ANSWER.  24 commuter trains, under given conditions.

Number from 6:00 a.m. - 8:40 a.m., inclusive: 9

Number from 9:00 a.m. - 4:00 p.m., inclusive: 15

 

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