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12.04.2021 •
Mathematics
Mathematics help with this
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Ответ:
The time of a commercial airplane is 280 minutes
Step-by-step explanation:
Let
x > the speed of a commercial airplane
y > the speed of a jet plane
t > the time that a jet airplane takes from Vancouver to Regina
we know that
The speed is equal to divide the distance by the time
y=2x > equation A
The speed of a commercial airplane is equal to
x=1,730/(t+140) > equation B
The speed of a jet airplane is equal to
y=1,730/t > equation C
substitute equation B and equation C in equation A
1,730/t=2(1,730/(t+140))
Solve for t
1/t=(2/(t+140))
t+140=2t
2t-t=140
t=140 minutes
The time of a commercial airplane is
t+140=140+140=280 minutes