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Time And Distance

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☼ Formulae  ( Problems on Time, Speed  &  Distance ) :

■ Speed  =\frac{\mathrm{Distance}}{\mathrm{Time}}

■ Time  =  \frac{\mathrm{Distance}}{\mathrm{Speed}}

■ Distance  =  ( Speed × Time )

■ x  km/hr  =  \left(\mathrm{x\ }\times\ \frac{5}{\mathrm{18}}\right)m/sec.

■ y  m/sec  =\left(\mathrm{y\ }\times\ \frac{\mathrm{18}}{5}\right)  km/hr.

■ If  a  certain  distance is covered at x km/hr  and  the same distance  is covered  at  y km/hr,  then the average speed during whole journey  =  \left(\frac{2\mathrm{xy}}{\mathrm{x\ }+\mathrm{\ y}}\right)  km/hr.

■ When the distance is constant, then the relation between speed and time is in inverse proportion.

That is     A       B
Speed      a    :   b
Time       b    :    a

A       B        C
Speed     a   :   b    :    c
Time      \frac{1}{a}   :    \frac{1}{b}    :  \frac{1}{c}

 

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