Arithmetic Aptitude :: Time and Distance
Time and Distance - Important Formulas
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1. Speed, Time and Distance.
speed = \([\frac { Distance } {Time } ]\) ,Time = \([\frac { Distance } {Speed} ]\),Distance = ( speed x Time )
2 . km/hr to m/sec conversion:
x km/hr = [ x x \(\frac { 5 } { 18 } \) ] m /sec
3 . m/sec to km/hr conversion:
x m/sec = [ xx \(\frac { 18 } { 5} \) ] km /hr
4. If the ratio of the speeds of A and B is a : b, then the ratio of
the times taken by them to cover the same distance is \(\frac { 1 } { a } \) : \(\frac { 1 } {b } \) or b : a
5.Suppose 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 [ \( \frac { 2 XY} { X+Y } \) ] km /hr |