(i)The time taken by a train to cover a fixed

(i) The time taken by a train to cover a fixed distance and the speed of the train are inversely proportional. ‘

e.g. Let a train cover 100 km in 1 h with speed 100 km/h.

Then, the same train cover 100 km in 30 min with speed 200 km/h.

(ii) The distance travelled by CNG bus and the amount of CNG used are directly proportional.

e.g. Let a CNG bus can travelled 10 km in 1 kg of CNG.

Then, the same CNG bus travelled 20 km in 2 x 1 = 2 kg of CNG.

(iii) The number of people working and the time to complete a given work are inversely proportional to each other.

e.g. Let 20 workers can complete a work in 1day.

Then, 10 workers can complete the same work in 2 days.

(iv) Income tax and the income are directly proportional to each other, e.g. Let Mr X have 4.5 lakh annual income.

Then, he pay 10% income tax on his income.

But if Mr X have 5.5 lakh annual income, then he has to pay 30% income tax on his salary/income.

(v) Distance travelled by an auto rickshaw and time taken are directly proportional to each other.

e.g. Let an auto rickshaw takes 2 h to travel 10 km.

Then, it will take 4 h to travel 20 km.