General Maths Puzzle Logical Reasoning

two identical train at the equator start travelling round the world in opposite directions.they start together run at the same speed and on different track .
which train will wear out its wheel treads first.

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General Other Question

A hall is 15 c.m long and 12 c.m broad.If the sum of the areas of floor and ceiling is equal to the sum of the areas of four walls.Then the volume of the halls is? a man starts going for morning walk everyday. the distance walked by him on the first day was 2 km. Every day he walks half of the distance walked on the previous day. What can be the maximum total distance walked by him in his lifetime?
1) 4 km
2) 20 km
3) 8 km
4) Data inadequate