self Maths Puzzle

two stations A and B are 100 km apart. Two cars start from point A and B at speed of 48 kmph and 64 kmph respectively and return back to their original position . what is the time gap between their second meet?

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self Other Question
What is the remainder when1044*1047*1050*1053 is divided by 33. There are 128 cubes with me which are coloured according to two schemes viz.

64 cubes each having two red adjacent faces and one yellow and other blue on their opposite faces while green on the rest.
64 cubes each having two adjacent blue faces and one red and other green on their opposite faces, while red on the rest. They are then mixed up.
1.
How many cubes have at least two coloured red faces each ?
2.
What is the total number of red faces ?
3.
How many cubes have two adjacent blue faces each ?
.
How many cubes have only one red face each ?