 Hello and welcome to the session. In this session we discussed the following question which says the length and the breadth of a playground are 52 meters, 50 centimeters and 30 meters, 50 centimeters respectively. Find the cost of touching it at rupees 2 per square meter. How long will a man take to go 2 times round the field if he walks at the rate of 4 meters per second? So we are given the length and breadth of a playground and we have to find the cost of touching the playground at rupees 2 per square meter. We also have to find the time in which the man will go 2 times round the field and it's given that he walks at the rate of 4 meters per second. So before we move on to the solution for this question let's recall the formula for the area of a rectangle. This is equal to L into B where L is the length of the rectangle, B is the breadth of the rectangle then the formula for the perimeter of a rectangle is equal to 2 into L plus B where again L is the length of the rectangle, B is the breadth of the rectangle. This is the key idea to be used in this question. Now we move on to the solution for this question. We are given that the length of the playground is equal to 52 meters 50 centimeters which is equal to 52.5 meters then the breadth of the playground is equal to 30 meters 50 centimeters which is equal to 30.5 meters. Now the area of the playground is equal to length of the playground which is 52.5 meters multiplied by the breadth of the playground which is 30.5 meters. And so this is equal to 16001.25 meters square is the area of the playground. It's given that the rate of surfing the playground is equal to rupees 2 per meter square. Now the total cost of surfing the playground would be equal to rupees 2 multiplied by the area of the playground which is 16001.25 and so this would be equal to rupees 3202.50 is the total cost of surfing the playground. Next let's find out the perimeter of the playground. This is equal to 2 into the length which is 52.5 meters plus the breadth which is 30.5 meters. This is equal to 2 into 83 meters which is equal to 166 meters is the perimeter of the playground. In one round of the playground the man covers 166 meters then in two rounds of the playground the man would cover 166 into 2 meters which is equal to 332 meters. It's also given that the man walks at the rate of 4 meters per second that is in one second the man covers 4 meters or we can say that the time taken by the man to cover 4 meters is equal to 1 second and we have to find out the time taken by the man to cover 332 meters and this is equal to 1 upon 4 into 332. Now 4, 83 times is 332 so this is equal to 83 seconds and this is equal to 1 minute 13 seconds. So we say that the man will take 1 minute 13 seconds to go 2 times round the feet. So this is our final answer. This completes the session. Hope you have understood the solution of this question.