On a journey, a motorist travels the first 40km in 1_2hour, the next 34km in 25mins and the last 7km in 5 minutes. What is the average speed for the whole journey?

Answer 1

To find the average speed for the whole journey, we first need to calculate the total distance traveled and the total time taken.

Total distance = 40km + 34km + 7km = 81km
Total time = 1/2 hour + 25/60 hour + 5/60 hour = 1.2 hours

Average speed = Total distance / Total time
Average speed = 81km / 1.2 hours
Average speed = 67.5 km/h

Therefore, the average speed for the whole journey is 67.5 km/h.