The distance between points A and B is 12 km. The tourist walked from point A to point B for 2

The distance between points A and B is 12 km. The tourist walked from point A to point B for 2 hours at a speed of four whole one-second km / h, How many kilometers he had to go.

1. Let’s find out what distance the tourist covered in two hours, when he moved from point A to point B, if his speed was four whole one-second kilometers per hour:

2 * 4 1/2 = 2 * (4 * 2 + 1) / 2 = 2 * (8 + 1) / 2 = 2 * 9/2 = 9 kilometers.

2. Let’s determine how many kilometers the tourist has left to go if he moves from point A to point B, the distance between these two points is 12 kilometers, and the tourist has already covered 9 kilometers:

12 – 9 = 3 kilometers.

Answer: the tourist has three kilometers left to walk.