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sophialoperx
01.08.2019 •
Mathematics
Aplane can fly 420 miles in the same time as it takes a car to go 180 miles. if the car travels 80 mph slower than the plane, find the speed of the plane.
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Ответ:
time = distance/speed
.. 420/p = 180/(p -80)
.. 420(p -80) = 180p . . . . . . "cross multiply"
.. (420 -180)p = 420*80 . . . add 420*80 -180p
.. p = 33600/240 = 140
The speed of the plane is 140 mph.
Check:
.. Each trip takes 3 hours = 420/140 = 180/60
Ответ:
true
Step-by-step explanation: