How many 6 digit odd numbers are possible if the leftmost digit cannot be zero?

Can anyone me with 32,33,36,37,and 40.

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

Ihonestly have no clue if it's each or none.