Question 375650
SPEED OF CAR BE X MPH
TRAIN = X+30 MPH..
...
train distance = 120 miles
car distance = 80 miles
..
{{{time = distance / speed}}}
\..
train time = car time
{{{120/(x+30) = 80 /x}}}
multiply the equation by x*(x+30)
..
{{{(120*(cross(x+30)*(x)))/(cross(x+30))= ((80*(cross(x))*(x+30)))/(cross(x))}}}
...
120x= 80(x+30)
120x=80x+2400
-80x
120x-80x=2400
40x=2400
/40
x= 2400/40
x= 60 mph speed of car
speed of train = x+30 = 60+30 = 90 mph
...
m.ananth@hotmail.ca