A body covers 10 km in 10 minute next 5 km in 5 minute and next 5 km in 5 minute find the average speed.
Answers
Given : -
A body covers 10 km in 10 minute next 5 km in 5 minute and next 5 km in 5 minute.
To find : -
Average speed of a body
Solution : -
In first case
A body covers 10 km in 10 minute
1 km = 1000m
Multiply 10 by 1000 to convert kilometre in meter
→ Distance (D1) = 10 × 1000 = 10000m
1 min = 60 s
Multiply 60 by 10 to convert minute in hour
→ Time (t1) = 10 × 60 = 600s
In second case
A body covers 5 km in 5 minute
Distance = 5km
→ Distance (D2) = 5 × 1000 = 5000m
Time = 5 min
→ Time (t2) = 5 × 60 = 300s
In third case
A body covers 5 km in 5 minute
Distance (D3) = 5000m
Time (t3) = 300s
Now,
As we know that
→ Average speed = Total distance travelled/total time
→ Average speed = D1 + D2 + D3/t1 + t2 + t3
→ Average speed = 10000 + 5000 + 5000/600 + 300 + 300
→ Average speed = 20000/1200
→ Average speed = 16.6 m/s
Hence,
Average speed of body is 16.6 m/s
Answer:
Average speed = Total distance ÷ Total time
- = 10+5+5÷10+5+5
- =20÷20
- = 1
Average speed = 1km/min .