A car moves for half of its time at 80 km per hour, and for rest of the time at 40 km per hour. If Total distance covered is 60 kilometres, find the average speed of the car.
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The problem can be solved by two methods
Method 1 :
Vav = 80 + 40 / 2
= 120/2
= 60 km /h
Method 2 :
Let the half time intervals be t
Therefore 60 = 80t + 40t
t=1/2
total time = 1/2*2 = 1hr
vav = Total distance / Total time
= 60 / 1
= 60 km/h
Method 1 :
Vav = 80 + 40 / 2
= 120/2
= 60 km /h
Method 2 :
Let the half time intervals be t
Therefore 60 = 80t + 40t
t=1/2
total time = 1/2*2 = 1hr
vav = Total distance / Total time
= 60 / 1
= 60 km/h
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