Question

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Answer 1

3rd answer is correct

Explanation:

We know that,

1 hour = 60 minutes

To find the minutes in 3¼h, let the unknown number of minutes be x.

`\sf \: 1h \rightarrow 60 \min\\ \sf3 (1)/(4) h \: \rightarrow \: x \: \: \: \: \: \: \: \: \: \: \: \: \:`

First, make 3¼ as an improper fraction.

`\sf \: 3 (1)/(4) \red \rightarrow \: (13)/(4) \\`

So,

`\sf \: 1 \rightarrow 60 \min\\ \sf (13)/(4) \: \rightarrow \: x \: \: \: \: \: \: \: \: \: \: \: \:`

Now, use cross multiplication.

`\sf1 * x = 60 * (13)/(4) \\ \sf \: x = 195`

Therefore, 3¼ hours have 195 minutes