two trains are 2 kms apart. Speed of one train is 20m/s and the other train is running at 30 m/s. Lengths of the trains are 200 and 300m. In how much time do the trains cross each other?
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In a club there are certain no. of males and females. If 15 females are absent then no. of males will be twice that of females. If 45 males are absent then female strength will be 5 times that of males. Find no. of males actually present.
The cycle has following specifications: The rear derailer is on the 14 tooth gear and the front derailer is on the 52 tooth gear. The rear gear has 14 teeth. The diameter of the rear wheel is 27". If a cyclist pedals at 75 revolutions per minute, then what will be the speed achieved?
Mohan is thirteenth from the left end in a row of children. Prabir is twelfth from the right end and eighteenth from the left end. How many children are towards the right of Mohan in that row? (a) 12 (b) 18 (c) 17 (d) Cannot be determined (e) None of these
There are two circles, one circle is inscribed and another circle is circumscribed over a square. What is the ratio of area of inner to outer circle?
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