Question

7. A car travels 1/3rd distance on a straight road with a velocity of 10 kahr, next./And with
velocity 20km/hr and the last 1/3rd with velocity 60 km/hr. Then average velocity of the car in the whole journey is3n km/hr. Find the value of n​

Answer 1

let the distance be 60 km

distance covered by car with speed

10km/hr--->20km; time taken =2hr

20km/hr--->20km; time taken =1hr

60km/hr--->20km; timetaken=1hr/3

Now,

average velocity=>

3nkm/hr=60/(10/3)km/hr

=18km/hr

n=6

Thanks

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