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3

120 miles.

In 1HR the two trains will travel 50 and 70 miles respectively before crossing

And=32

1st column in ascending order values are 1-2-3-4-5, total 15

2nd column in ascending order is three times of first column. 3-6-9-12-15,total 45

3rd column in ascending order is five times of first column. 5-10-15-20-25, total 75

Hence value of every shaded circle is decided

4th column is 3+1+25+15+5, total49

Hence 5th column is 20+6+2+3+1=32