Two cars, the distance between which is 2100 m, are moving towards each other. One of them goes at a speed of 20 m / s

Two cars, the distance between which is 2100 m, are moving towards each other. One of them goes at a speed of 20 m / s, and the other – at a speed of 15 m / s. What is the distance d (m) between the cars in t s?

Let’s calculate at what speed the process of convergence of the first and second cars will take place:

20 + 15 = 35.

Let’s calculate how many meters the distance that they will jointly cover in a time equal to t seconds will be equal:

35 * t = 35t.

Let’s calculate what the distance between these cars will be, if 35t ≤ 2100:

d = 2100 – 35t.

Let’s calculate what the distance between cars will be if 35t> 2100:

d = 35t – 2100.

Answer: The distance will be equal to (2100 – 35t) m or (35t – 2100) m.