Answer:
80x3 - 180x2 + 109x - 20
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4
Step-by-step explanation:
Divide 132 by 16 to get 8.25 and you have to round up because you can’t fit 0.25 of people on a table.
Let x = first plane's speed.
We have the equation:
2 hours * x km/h + 1.5 hours * (x+60) km/h = 3135 km.
3.5 hours*x km/h + 90 km = 3135km
3.5hours*x km/h = 3045km
x = 870 km/h.
The first plane is traveling at 870 km/h, therefore since it is 60 km/h faster, the second plane is traveling at 930 km/h.
