A car travels 30km at a uniform speed of 40km/h and next 30 km at a uniform speed of 20km/h. find its average speed?
- 28.7 km/h
- 26.7 km/h
- 26.5 km/h
- 25.4 km/h
Explanation
To find the average speed, use the formula:
Average Speed = Total Distance / Total Time
---
Step 1: Total Distance
= 30 km + 30 km = 60 km
---
Step 2: Time taken in each segment
- First 30 km at 40 km/h
Time = Distance ÷ Speed = 30 ÷ 40 = 0.75 hours
- Next 30 km at 20 km/h
Time = 30 ÷ 20 = 1.5 hours
---
Step 3: Total Time
= 0.75 + 1.5 = 2.25 hours
---
Step 4: Average Speed
= Total Distance ÷ Total Time = 60 ÷ 2.25 = 26.67 km/h
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