Bajinder runs ten times around a square track and covers 4 km. Find the length of the track.
Side of the square track = 100 m
Step 1: Convert kilometres to metres.
4 km = 4000 m.
Step 2: Find the distance of one round.
He runs 10 rounds to cover 4000 m.
So, distance of one round = ( dfrac{4000 ext{m}}{10} ) = ( 400 ext{m} ).
Step 3: Relate one round to the square’s perimeter.
One full round around the square = Perimeter of the square.
Perimeter ( P = 4 imes ext{side} ).
Step 4: Form the equation and solve for the side.
( 4 imes ext{side} = 400 ext{m} )
( ext{side} = dfrac{400}{4} )
( ext{side} = 100 ext{m} ).
Answer: The length of each side of the square track is 100 m.