calculate the average speed in km/h of a car travelling at 50km/h for 30minutes, and then at 71 km/h for one hour
total distance: 50*0.5 + 71*1.0 km
total time: .5 + 1.0 hr
so, ...
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To calculate the average speed in km/h, you need to find the total distance traveled and divide it by the total time taken.
First, let's calculate the distance traveled at 50 km/h for 30 minutes:
Distance = Speed × Time
Distance = 50 km/h × 0.5 h (30 minutes converted to hours)
Distance = 25 km
Next, let's calculate the distance traveled at 71 km/h for 1 hour:
Distance = Speed × Time
Distance = 71 km/h × 1 h
Distance = 71 km
Now, let's determine the total distance traveled:
Total Distance = Distance1 + Distance2
Total Distance = 25 km + 71 km
Total Distance = 96 km
The total time taken is 0.5 hours + 1 hour = 1.5 hours.
Finally, let's calculate the average speed:
Average Speed = Total Distance ÷ Total Time
Average Speed = 96 km ÷ 1.5 h
Average Speed ≈ 64 km/h
Therefore, the average speed of the car is approximately 64 km/h.