Rates, SM-Bank 021

Kate buys a new computer.

The disk in its hard drive makes 120 full turns every second.

How many minutes will it take for the disk to make 324 000 full turns? (2 marks)

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\(45\ \text{minutes}\)

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\(\text{Turns in 1 minute}\)

\(= 120\times 60\)

\(= 7200\)

\(\therefore\ \text{Minutes needed}\)

\(= \dfrac{324\ 000}{7200}\)

\(=45\ \text{minutes}\)