Answer:
The speed of the first train is 45 mph and the speed of the second train is 75 mph
Step-by-step explanation:
Let x represent the speed of the first train in mph. Since the second train, is 30 mph faster then the first, therefore the speed of the second train is (x + 30).
The first train leaves at 1:00 pm, therefore at 6:00 pm, the time taken is 5 hours. Therefore the distance covered by the first train at 6:00 pm = x mph * 5 hours = 5x miles
The second train leaves at 3:00 pm, therefore at 6:00 pm, the time taken is 3 hours. Therefore the distance covered by the second train at 6:00 pm = (x + 30) mph * 3 hours = (3x + 90) miles
Since the second train overtakes the first at 6:00 pm, hence:
3x + 90 = 5x
2x = 90
x = 45
Therefore the speed of the first train is 45 mph and the speed of the second train is 75 mph (45 mph + 30 mph).
The question is incomplete, but if we assume that you mean AD = TD , we have :
AD = TD ===》 5x + 3 = x + 27
===》 4x = 24
===》 x = 6
_________________________________
AD = 5 × ( 6 ) + 3
AD = 30 + 3
AD = 33
J is not a function.
for y to be a function of x, it needs to have every input x value mapping to one, and only 1, output y value.
we see that for graph J, x = -3 maps to both -3 and -2.
can't be a function
Answer:
26
Step-by-step explanation:
DE+EF=DF
Subsitue thise x values for DE, and DF
12+x=38
=26
