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Must Do: Speed, Distance and Time tricks with Example



Time and Distance
The term times and distance area related to the speed of moving objects 
Speed — We define the speed of an object as the distance covered by it in a unit time interval. 
Speed =(Distance travelled)/(time taken)
⇒  Distance travelled = Speed × time 
⇒ Time =  Distance/Speed 


Unit of measurement 
If distance is measured in kilometer, we measure time in hours and speed is written as km/hr. 

If distance is measured in meter, then time is taken in second and speed written as m/s 

Conversion of unit
1 km/hr = (1000 mtr)/(60×60 seconds)=5/18 m/s
1 m/s =18/5 km/hr

Ex. – A train having length 500 m passes a pole in 30 second. Find the speed of a train (in km/hr) 
⇒Speed=Distance/time=500/30 m/s
=500/30×18/5 km/hr 
= 60 km/hr 

Some useful short cut methods

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