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Question

# A car travels 13rd distance on a straight road with a velocity of 10 km/hr, next 13rd with velocity 20 km/hr and the last 13rd with velocity 60 km/hr. What is the average speed of the car in the whole journey?

A
4 km/hr
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B
6 km/hr
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C
12 km/hr
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D
18 km/hr
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Solution

## The correct option is D 18 km/hrLet 'd' be the total distance travelledTime taken for 1st one-third distance =d30 hrsTime taken for 2nd one-third distance =d60 hrsTime taken for last one-third distance =d180 hrsAverage speed=total distancetotal time takenv=dd30+d60+d180v=18 km/hr

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