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Algebra_4
Chapter 99
Problem 3
Select a different problem
Example:
At t
1 = 1 a.m. two trains were D = 700 miles apart and headed toward each other.
If they collided at t
2 = 11 a.m., find the velocities of both trains if
one was traveling v
2 = v
1 + 30 miles per hour faster than the other.
In shorthand form the problem can be written as follows:
v
1(t
2 - t
1) + v
2(t
2 - t
1) = D........(1)
and v
2 = v
1 + 30 ................(2)
Substituting (2) into (1) and solving for v
1 gives
}{2(10)}=20\frac{mi}{hr} )
and
