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**TIME AND DISTANCE FORMULAS- :**

## 1.The Relation between Time,Distance and Speed is , Distance=Speed*Time Speed=Distance/Time Time=Distance/Speed

**2.Convertion of Speeds:**

### KMPH To MPS(Kilometre per Hour TO Metres per Hour):

1 kmph = 5/18mps MPS To KMPH(Metres per Hour To Kilometre per Hour) 1mps=18/5kmph

**3.TRAINS:**

If a train has to cross a man or any particular point then it has to cover a distance equal to its own length. If a train has to cross a bridge or tunnel or platform etc.

then it has to cover a length equal to its length + platform/tunnel length.

**4.RELATIVE SPEED:**

When two speeds are in opposite direction, Relative speed = sum of the speeds.

When two speeds in the same direction, Relative speed = difference of the speeds.

**5.BOATS AND STREAMS:**

**Still Water:** water without motion.A boat can traveL in that water with their original speeds.

**STREAM / CURRENT :** Water flow with some speed.

**Down stream:** along with the flow.

**Upstream:** against the water flow. If the speed of the boat in still water is b kmph and speed of the current is c kmph respctively,

then Downrate(*) = b+c

Uprate (y) = b-c

Speed of the boat (b) = x+y/2

Speed of the current = x-y/2

## 6.Average Speed:

Average Speed =Total Distance/Total Time When two equal distance are covered at two different speeds (x,y),

then the average speed is =2xy/x+yKm/hr.

When three equal distance are covered at three different speeds (x,y,z),

then the average speed is = 3xyz/xy+yz+zx

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