Question

give me answer plzz

Answer 1

ANSWER
................................

250/x + 120/y =4 

250a+120b=4 


130/x + 140/y = 4.3 


130a+140b=4.3 


250 a + 120 b = 4 .............

130 a + 140 b = 4.3 .............

multiply (1)by -7


Multiply (2) by 6

-1750 a -840 b = -28

780 a + 840 b = 25.8



-970 a = -2.2


/ -970


a = 0.00227


250 a + 120 b = 4


0.57 + 120 b = 4


120 b = 4 -0.5


120 b = 3.43


b = 0.02861
x=1/a= 1/0.00227= 440 km/h-------------Train
y=1/b=1/0.02861= 35 km/h-------------- Car 
CHECK
130/440 +140/35= 4.3 hours

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