Trains leave Lucknow for Varanasi every hour on the hour, and trains leave Varanasi for Lucknow every hour on the hour. Every journey takes exactly 5 hours. How many Varanasi-bound trains does a Lucknow-bound train meet on the way, not counting any met at the stations?

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9. A train leaving Varanasi at time 0 is on the line from 0 to 5. Opposite trains on the line during (0, 5) left Lucknow at −4, −3, …, 4 → 9 trains. (Those leaving at −5 and 5 are met only at the stations.)

Trains leave Lucknow for Varanasi every hour on the hour, and trains leave Varanasi for Lucknow every hour on the hour. Every journey takes exactly 5 hours. How many Varanasi-bound trains does a Lucknow-bound train meet on the way, not counting any met at the stations?

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