A car travels Rd distance straight road with a velocity of 10 km/hr , next Rd with velocity of 20 km/hr and the last Rd with velocity of 60 km/hr. what is the average velocity of the car in the whole journey?
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Total distance=3Rd
Since Time=Distance/Velocity
T1=Rd/10
T2=Rd/20
T3=Rd/60
Therefore,
Total time=Rd/10 + Rd/20 + Rd/60
1Rd/6
Therefore,
Average velocity=3Rd/(1Rd/6)
=3Rd*6/Rd(On cancelling Rd we get 3*6)
=18km/h
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