Aptitude - Speed and Distance

Formulaes

Speed = Distance⁄Time
Time = Distance⁄Speed
P km/hr = (P x 5⁄18)m/sec
P m/sec = (P x 18⁄5)km/hr

If the ratio of the speeds of P and Q is p:q, then the ratio of the times taken by them to cover the same distance is

1⁄p:1⁄q or q : p

The average speed of the journey is

(2pq⁄p+q)km/hr

if a man covers a certain distance at p km/hr and an equal distance at q km/hr

Solved Examples