Answer:
Average speed = 9.91 m/s
Explanation :
Total distance covered by a runner = 200 m
Time taken to complete this distance = 20.19 sec
We need to find the average of runner speed in meter/sec
We use the speed, distance, time formula
speed = 
Average speed = 9.91 m/s
that's the final answer.
I hope it will help you.
Answer:
The answer to your question is: 3780 m²
Step-by-step explanation:
Data
Rectangular ceiling
base = 63 ft
height = 60 ft
Formula
Area = base x height
Process
Area = 63 x 60
= 3780 m²
Answer:
Explanation:
<u>1. Data:</u>
i) Distance traveled by the cars:
ii) Speed of the cars:
iii) Time to arrive at the suburb:
- t₂ - t₁ = 2 hour ⇒ t₂ = t₁ + 2
<u>2. Equations:</u>
time = distance / speed
- t₂ = 480 / v₂
- t₁ = 480 / v₁ = 480 / (v₂ + 20)
t₂ - t₁ = 2 hour
↓ ↓ ↓
480/v₂ - 480/ (v₂ + 20) = 2
<u>3. Solve the equation</u>
480(v₂ + 20) - 480(v₂) = 2 × (v₂ + 20) (v₂)
240(v₂ + 20) - 240(v₂) = (v₂ + 20) (v₂)
240v₂ + 4800 - 240v₂ = (v₂)² + 20v₂
(v₂)² + 20v₂ - 4800 = 0
(v₂ + 80) (v₂ - 60) = 0
v₂ = - 80
v₂ = 60
Only the positive solution has physical meaning:
- v₁ = 60km/h + 20km/h = 80km/h ← answer
The answer to this question is 12y.
Answer:
- b = P - a - a - B
- b = P - 2a - B
Step-by-step explanation:
The perimeter is the sum of the lengths of the sides, so is ...
P = B + a + b + a
Subtracting the terms that are not "b" from both sides of the equation, you get
P - a - a - B = b
Swapping sides of the equal sign, this matches the first choice:
b = P - a - a - B
The two "-a" terms are "like terms" so can be added together. The result matches the second choice.
b = P - 2a - B
