Atrain leaves city a and travels north at 85 km per hr. another train leaves at the same time and travels south at 95 km per hour. how long will it take before they are 425 km apart?
it will before they are 425 km apart.

their relative speed is 95+85=180 kmph.

so 180 km/h = 425 km / x => x= 425/180=85/36

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation: