The length of the street is 3 km, and the boy’s step is 50 cm. How many steps does he need to take to walk the entire street?

Problem data: L (street length, distance traveled by the boy) = 3 km (SI S = 3000 m); l (length of one step) = 50 cm (in SI system l = 0.5 m).

The number of steps taken by the boy to pass the street is determined by the formula: n = L / l.

Let’s calculate: n = 3000 / 0.5 = 6000 steps.

Answer: It took the boy 6,000 steps to walk the street.