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Aptitude tricks for beginner and last minute revision

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1. Train Problems  Travelling towards each other Relative speed= X+Y  km/hr Travelling in the same direction Relative Speed= X-Y km/hr 2. Time and Work Work done by A and B              Work of A in one day =   LCM of X and Y                                                                X X men in Y hours Z days:                                                          Here, M= Men             H= Hours             D= Days             W= Work 3. Boats Problem Let, Downstream speed = A km/hr                   Upstream speed      = B  km/hr                         Speed of boat in still water = 1/2(A+B) km/hr                         Speed of Stream = 1/2(A-B)  km/hr 4. Percentage Problem       Problem with phrases, a is what percent of b what percent of b is a what percent is a of b           Use 5. Interest Problems Simple Interest problems          Here, SI = Simple Interest