Question

A bicycle tire completes 9/10 of a revolution every 1/3 second. How many revolutions will the tire complete every minute?

Answer 1

162 RPM

Explanation:

Start by multiplying 9⁄10 by the Multiplicative Inverse of ⅓, which is 3:

9⁄10 ÷ ⅓ → 9⁄10 × 3 = 2 7⁄10

After this, multiply the result by sixty seconds, since there are sixty seconds in one minute:

60 × 2 7⁄10 = 162

So, it will make 162 RPM.

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Answer 2

Find out how many revolutions it makes in 1 second.

9/10 * 3 = 27/10 = 2.7

Set up a proportion.

There are 60 seconds in a minute.

2.7/1 = x/60

Cross multiply:

x = 2.7 * 60

x = 162

So it will make 162 revolutions a minute.