 Hello and welcome to the session. In this session we discussed the following question which says, the diameter of the wheel of a car is 42 cm. How many revolutions will it make to travel 0.132 km? Before proceeding on to the solution, let's recall the formula To find the circumference of a circle, this is equal to 2 pi r, where r is the radius of the circle. This is the key idea to be used in this question. Now we move on to the solution. We are given that the diameter of the wheel is equal to 42 cm, so the radius of the wheel which is equal to r is equal to 42 upon 2 equal to 21 cm. Now the circumference of the wheel is equal to 2 pi r that is equal to 2 into 22 upon 7 into 21. Now 3 times is 21 and so this is equal to 132 cm or you can say this is equal to 1.32 meters. This is the circumference of the wheel. We know that in one revolution the wheel covers the distance equal to its circumference. So we say that 1.32 meters of the distance is covered in one revolution and we have to find that how many revolutions will make it to travel 0.132 km. Now 0.132 km is equal to 132 meters. So let's find out how many revolutions will make it to travel 132 meters of the distance. So 132 meters of the distance is covered in 1 upon 1.32 into 132 that is this is equal to 100 upon 132 into 132. 132 cancels with 132 and so this is equal to 100. Thus we say the wheel will make 100 revolutions to travel 0.132 km. So this is our final answer. This completes the session. Hope you have understood the solution of this question.