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A person started two watches, he observed that after one hour, one watch gains 1 min/hr and the second watch loses 2 min/hr. After how much time will the two watches have a difference of one hour.

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if 1!+2!+3!………10! in this sum what is the lost digit.
Four persons A, B, C and D are playing cards. Each person has one card, laid down on the table below him, which has two different colours on either side.
There are 2 red, 2 green and 2 blue. The colours visible on the table are Red, Green, Red and Blue.
They see the color on the reverse side and give the following comment.

A. Yellow or Green
B. Neither Blue nor Green
C. Blue or Yellow
D. Blue or Yellow

Given that out of the 4 people, 2 always lie find out the colours on the cards each person.