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Short Notes on Time and Distance

TIPS AND FORMULAS ON TIME AND DISTANCE: 1. Speed =   Distance/Time 2. Time =   Distance /Speed 3. Distance =  Speed x Time 4 . km/hr to m/s conversion: 1 kmph =   5/18 m/s 5.  m/s to km/hr conversion:   1 m/s =   18/5 m/s 6.  If the ratio of speeds of train A and B is a : b, then the ratio of time taken by them to cover the same distance =  b : a. 7.  If a man covers a certain distance at x km/hr and an equal distance at y km/hr. Then,the average speed during the whole journey is 2xy/(x + y) km/h 8 . The time taken by a train in passing a pole or standing man is the same as the time taken by the train to cover a distance equal to its own length. 9.  The time taken by a train of length 'L' metres in passing a stationary object of length 'B' metres is equal to the time taken by the train to cover a distance equal to  (L + B) m. 10.  If two trains are moving in the same directions at u m/s and v m...
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Important Mensuration formulas and short notes for 3D figures

We have already discussed  Mensuration 2D Short notes , here we will discuss all about Mensuration 3D figures. You can also know some important facts of 3D figures. In this article, abbreviations used are TSA = Total Surface Area, CSA = Curved Surface Area. SSC CGL Tier II 2017 Mock Tests on Latest Pattern - Attempt Now Available in Hindi & English. Get Detailed Analysis & All India Rank # Cuboid : Given is the cuboid of lenth  l,  breadth  b  and height  h.  T.S.A. = 2(lb + bh + lh) Volume = lbh Diagonal =    Important:  If area of faces of cuboid are x,y and z Then, volume of cuboid  # Cube Let the side of given cube is 'a'. T.S.A. = 6a 2 Volume = a 3 Diagonal of cube =   # Sphere let the radius of given sphere is ' r'  and in case of sphere  total surface area is equal to curved surface area . C.S.A. = T.S.A. =  Volume =    # Hemi-Sphere Assume ...
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Quant Short Tricks on Multiplication

1.   Multiplication using multiples Assume that we should find out the result of 12 x 15.  12 x 15    ( Here we can write this 15 as 5 x 3) =  12 x 5 x 3 (now  12 x 5 becomes 60) =  60 x 3 ( For this you just calculate 3 x 6, that is 18 and add one Zero to it. that is 180) =  180 2.   Multiplication by distribution   Assume that we should find out the result of 12 x 17 12 x 17   ( Here we can divide this 17 as 10+7. Here, multiplying 12 with 17 is same as multiplying 12 with 10 and 7 separately and then adding the results) so, we can write it as = (12 x 10) + (12 x 7)  = 120 + 84 = 204  3.   Multiplication by "giving and taking" 12 x 47   ( Here its little difficult for us to calculate the multiplication of 12 and 47 mentally. so just check for the ROUNDED number nearer to 47. Yes it is 50. so..... = 12 x (50 - 3)...
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