Average speed of the entire journey is 3.08 km/hr
Step-by-step explanation:
- Step 1: In the first half, given that the speed = 4 km/h and time = 2 1/2 = 2.5 hrs. Calculate the distance covered.
Distance = Speed × Time = 4 × 2.5 = 10 km
- Step 2: In the second half, given that speed = 2 1/2 = 2.5 km/hr and time = 4 hrs. Calculate the distance covered.
Distance = 2.5 × 4 = 10 km
- Step 3: Calculate average speed.
Average Speed = Total distance/Total time
= 10 + 10/2.5 + 4 = 20/6.5
= 3.08 km/hr
Answer:
90°
Step-by-step explanation:
2x = 60° and x = 30 the sum of interior angles in a triangle is = 180°
60° + 30° + y = 180°
y = 90°
The area of the cross section of the column is 81π
<h3>What is the area of the cross section of the column?</h3>
The given parameters are
Circumference, C = π18 meters
The area of the cross section of the column is calculated using the following circle formula
A = π(C/2π)^2
Substitute C = π18 in A = π(C/2π)^2
A = π(π18/2π)^2
Evaluate the quotient
A = π(9)^2
This gives
A = 81π
Hence, the area of the cross section of the column is 81π
Read more about areas at:
brainly.com/question/22972014
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Answer: the brother is 10
Step-by-step explanation:
