A group of tourists left point A at a speed of 3.5 km / h. After 1.4 hours, a pedestrian came out to meet her from

A group of tourists left point A at a speed of 3.5 km / h. After 1.4 hours, a pedestrian came out to meet her from point B, located at a distance of 10 km from the first and moved at a speed of 4.2 km / h. What was the distance between these groups of people 0.4 hours after the pedestrian left.

1. Find out how many kilometers a group of tourists covered in 1.4 hours if it was moving at a speed of 3.5 kilometers per hour:

1.4 * 3.5 = 4.9 (km).

2. Let’s determine how many kilometers a group of tourists covered in 0.4 hours if they were moving at a speed of 3.5 kilometers per hour:

0.4 * 3.5 = 1.4 (km).

3. Let’s find how many kilometers a pedestrian traveled in 0.4 hours if he walked at a speed of 4.2 kilometers per hour:

0.4 * 4.2 = 1.68 (km).

4. Find out how many kilometers they covered:

4.9 + 1.4 + 1.68 = 7.98 (km).

5. Let’s determine what distance was between them in 0.4 hours after the pedestrian left:

10 – 7.98 = 2.02 (km).

Answer: there were 2.02 kilometers between them.