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If you are going a constant speed the whole way through the trip it would take 3 hours to drive 135 miles at a speed of 45 m/h
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135 miles divided by 45 miles/hour = 3 miles

Answer:  The required time taken to drive 135 miles is 3 hours.

Step-by-step explanation:  We are given to find the time taken to drive 135 miles at a speed of 45 miles per hour.

We will be using the UNITARY method to solve the problem.

We have

Time taken to drive 45 miles = 1 hour.

So, time taken to drive 1 mile will be

[tex]\dfrac{1}{45}~\textup{hour}.[/tex]

Therefore, the time taken to drive 135 miles is given by

[tex]\dfrac{1}{45}\times135=3~\textup{hours}.[/tex]

Therefore, the required time taken to drive 135 miles is 3 hours.

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