Answer: 36
Step-by-step explanation:
Each side of square are equal length
4 sides
9+9+9+9=36
N+14=17. n=3. So the missing number is 3.
Answer:
20 mph
Step-by-step explanation:
Let speed of Train a = Va mph
Let speed of Train b = Vb mph
Va = Vb + 30
Let time taken for Train a = Ta
Let time taken for Train b = Tb
time taken = distance travelled/speed
Ta = 350/Va = 350/(Vb+30)
Tb = 140/Vb
But they both travel in the same amount of time.
So, Ta = Tb
Cross multiply
Divide both sides by 210
For this you have to get r by itself so you put 1 over 3 and move it to the other side and then you get 2/3 as an answer