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Question

A car travel first 13rd of the total distance at 30 km/hr, next 13rd of the total distance at 40 km/hr and last 13rd of the total distance at 24 km/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 C 30
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=30 km/hr

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