A car travel first 13rd of the total distance at 30km/hr, next 13rd of the total distance at 40km/hr and last 13rd of the total distance at 24km/hr. It's average speed in km/hr for the whole Journey is
A
40
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B
35
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C
30
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D
28
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Solution
The correct option is C30 The whole journey is shown in the below figure.
We know that average speed is given as vavg=Total distanceTotal time vavg=St1+t2+t3 vavg=SS3(30)+S3(40)+S3(24) ⇒vavg=36012=30km/hr