# The wheel circumference of the cart has a length of 18 dm. Calculate how many revolutions per second

March 28, 2021 | education

| **The wheel circumference of the cart has a length of 18 dm. Calculate how many revolutions per second the wheel makes if it is known that in 1/4 hour it has covered 2.43 km.**

Let’s translate these tasks into a single unit of measurement.

18 dm = 0.0018 km.

1/4 hour = 900 sec.

1. Find how many revolutions are made by the wheel in 1/4 hour:

2.43 / 0.0018 = 1350.

2. Find how many revolutions are made by the wheel in 1 second:

1350/900 = 1.5.

Answer: 1.5 turns.

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