A boy in a train notices that he can count 31 telephone posts in 60 seconds. the distance between two posts is 60 meters. Calculate the speed of the train?
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If 'x' means '-', '-' means 'x', '+' means '/' and '/' means '+', then what is the value of 15 - 2 / 900 + 90 x 100?
If '<' stands for '-', '>' stands for 'x' and '@' stands for '/' then what will be the value of 27 > 81 @ 9 < 6
If 'W' means 'x', 'X' means '-', 'Y' means '+' and 'Z' means '/', then 28 Z 7 W 8 X 6 Y 4 = ?
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Leverage enables currency traders to do which of the following?