Problema Solution
Parallel processing is the simultaneous use of more than one computer to run a program. Suppose one computer, working alone, takes 4 h longer than a second computer to run a program. After both computers work together for 1 h, the faster computer crashes. The slower computer continues working for another 2 h before completing the program. How long would it take the faster computer, working alone, to run the program?
Answer provided by our tutors
Let
x = the hours that the second computer needs to run a program alone, x>=0
x + 4 = the hours the first computer needs to run a program alone (the first computer is slower since x + 4 > x)
The rate of the second computer is: 1/x program per hour
The rate of the first computer is: 1/(x + 4) program per hour
Now we can write the following equation:
1/x + 1/(x + 4) + 2*(1/(x + 4)) = 1
........
click here to see the equation solved for x
........
x = 2 hr (We need to ignore the negative solution -2 because the time can only be positive.)
The faster computer needs 2 hours to run the program when working alone.