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Question

# A speeding car travelling at 40km/hr decides to slow down to 30km/hr after covering half the distance. What is the average speed?

A
34.29km/h
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B
35.36km/h
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C
36.32km/h
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D
33.24km/h
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Solution

## The correct option is A 34.29km/hLets consider x= total distance covered by the carHalf of the distance covered with speed 40km/h at time t1t1=x80hrRemaining half distance covered with speed 30km/h at time t2t2=x60hrTotal time, t=t1+t2t=x80+x60=7x240hrAverage speed, vavg=TotaldistanceTotaltimevavg=x7x/240=2407vavg=34.29km/hThe correct option is A.

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