Q4 of 16 Page 40

A car with a speed of 60 km/hr takes 8 hours to travel some distance. What should be the increase in the speed if the same distance is to be covered in hours?

Speed of car and time will be inversely proportional because as the speed increases, time for the journey decreases.


Speed of car


Time




(k=constant)


(1)


Time for which distance is to be covered



Let increase in speed





From 1





So, speed should be increased by 4 km/hr.


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Which of the following statements is of inverse variation?

(1) The number of workers on a job and time taken by them to complete the job.


(2) The number of pipes of the same size to fill a tank and the time taken by them to fill the tank.


(3) Petrol filled in the tank of a vehicle and its cost.


(4) Area of the circle and its radius.


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If 15 workers can build a wall in 48 hours, how many workers will be required to do the same work in 30 hours?

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