Let the slower train's velocity be x-21
Let the faster train's velocity be x
We know that the approach speed is the sum of both speeds, so x+x -21= 2x-21.
The approach rate is given by Distance/time = 471/3 = 157mpH
x+x-21=157
2x=157+21
2x=178
x=89mph
The slower train is travelling 89-21 = 68mph
The faster train is travelling 89mph.
Answer:
62.5
Step-by-step explanation:
Data provided in the question:
Actual demand = 59
Previous forecast = 64
Alpha = 0.3
Now,
The forecast for the next period be using simple exponential smoothing will be given as
= [ Alpha × Actual demand ] + [ (1 - Alpha) × Previous forecast ]
= 0.3 × 59 + [ ( 1 - 0.3 ) × 64 ]
= 17.7 + 44.8
= 62.5
grand coulee dam (g) contains 2.5 times as much concrete as the hover dam (h)
Therefore,
g = 2.5 * h
h = 3.5 million
g = 2.5 * 3.5
g = 8.75 million yards of concrete
A because x is the original price, so you multiply by the tax (9%) which would convert to 1.09 which you would multiply to the x
