To calculate the total time taken for the whole journey, you need to determine the time taken for each leg of the trip and then sum them together.
For the first leg of the journey: Distance = 90 km Speed = 45 km/h
Using the formula Time = Distance / Speed: Time taken for the first leg = 90 km / 45 km/h = 2 hours
For the second leg of the journey: Distance = 240 km Speed = 80 km/h
Time taken for the second leg = 240 km / 80 km/h = 3 hours
To find the total time taken for the whole journey, you add the times for each leg: Total time = Time for the first leg + Time for the second leg Total time = 2 hours + 3 hours = 5 hours
Therefore, the total time taken for the whole journey is 5 hours.