Question 547041
train speed =x
distance =180

plane speed = 5x-30
distance = 450

t=d/r

100/x = 450/(5x-30)
time for both is same


cross multiply

100(5x-30)=450x
500x-3000=450x
500x-450x=3000
50x=3000
/50
x=60 mph speed of car

speed of plane = 5x-30
=5*60-30
=300-30
=270 mph speed of plane