Answer:
speed of train A = 70 + 20 = 90 miles per hour
speed of train B = 70 miles per hour
Step-by-step explanation:
Let
speed of train B = a
speed of train A = a + 20
Recall
speed = distance/time
The travel time is same for both train. Therefore, let us make time subject of the formula in the speed equation.
Time = distance/speed
270/a + 20 = 210/a
cross multiply
270a = 210(a + 20)
270a = 210a + 4200
270a - 210a = 4200
60a = 4200
divide both sides by 60
a = 4200/60
a = 70
speed of train A = 70 + 20 = 90 miles per hour
speed of train B = 70 miles per hour
Answer:
I think it is C
Step-by-step explanation:
If I'm wrong try B
Answer:
19..........................
Answer:
true
Step-by-step explanation:
Ok let's understand the question.
We want to know what values we get when n is positive in 1/n.
We get the values
0<1/n≤1
If we plug in 1: 1/1 = 1
2: 1/2 = .5
100: 1/100 = .01
10000000 = 1/10000000 = Small number close to 0.
n will always be more than 1 by the given (n>0).