# Another car drove past the car, moving at a speed of 72 km / h. After 10 seconds, the distance between

September 20, 2021 | education

| **Another car drove past the car, moving at a speed of 72 km / h. After 10 seconds, the distance between the cars became 100 m. At what speed was the second car moving?**

Let’s find the speed of the second car relative to the first one:

100: 10 = 10 m / s

Since the speed of the first car, expressed in meters per second, will be equal to:

72000/3600 = 20 m / s. , then the own speed of the second will be equal to:

20 + 10 = 30 m / s = 30 * 3600 = 108 km / h.

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