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50min's ago if it was 4 times as many min's past 3 o'clock, how many min's is it to 6o'clock

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Infosys Other Question

We have a brick of regular size. It weights 4 kilogrammes. How much do u think a similar brick, 4 times smaller, but made of the same material weigh? We have a large very thin sheet of rice paper which pile at the rate of 1 thousand sheets to the inch.
Supposing we tear the paper in half an put the two pieces together on top of each other and we tear them in half and put the 4 pieces together in a pile and then we tear them again in half and put the eight pieces in a pile and we continue like this upto 50 times, can u tell how high the final stack of paper would be?