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The running time for movie a is 40 minutes more than twice the running time for movie
b. if the running time for movie a is subtracted from triple the running time for movie​ b, the result is 45 minutes. find the running times for each movie.

Respuesta :

3b - a = 45
a = 2b + 40

Solve simultaneously.

3b - (2b + 40) = 45
3b - 2b - 40 = 45
b = 45 + 40
b = 95min (1 hour 35 min)

a = 2 (95) + 40
a = 230min ( 3 hour 50 min)
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