The time taken for a journey on a motorway varies inversely as

the average speed for the journey. The journey takes 1.5 h

when the average speed is 54 miles per hour. Identify the time

taken in hours for this journey when the average speed is 45

miles per hour.

Time that will be taken at speed of 45 miles/hr is 1.8 hrs

Step-by-step explanation:

Step 1: Given the speed of the journey = 54 miles/hr and time = 1.5 hours. Find the distance of the journey using the speed formula.

Distance = Speed * Time

= 54 * 1.5 = 81 miles

Step 2: Calculate the time taken for this journey given speed = 45 miles/hr

TIme = Distance/Speed

= 81/45 = 1.8 hrs