Ali goes on a car journey.The first 60 km of the journey takes 45 minutes.The remaining 20 km of the journey takes 30 minutes.Calculate his average speed, in kilometres per hour, for the whole journey
Question
Ali goes on a car journey.The first 60 km of the journey takes 45 minutes.The remaining 20 km of the journey takes 30 minutes.Calculate his average speed, in kilometres per hour, for the whole journey
Solution
To calculate Ali's average speed for the whole journey, we need to find the total distance traveled and the total time taken.
First, let's calculate the total distance. Ali traveled 60 km in the first 45 minutes and 20 km in the next 30 minutes. So, the total distance is 60 km + 20 km = 80 km.
Next, let's calculate the total time taken. Ali took 45 minutes for the first 60 km and 30 minutes for the remaining 20 km. So, the total time taken is 45 minutes + 30 minutes = 75 minutes.
To convert the total time from minutes to hours, we divide it by 60. So, the total time taken is 75 minutes / 60 = 1.25 hours.
Finally, to calculate the average speed, we divide the total distance by the total time taken. So, the average speed is 80 km / 1.25 hours = 64 km/h.
Therefore, Ali's average speed for the whole journey is 64 kilometers per hour.
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