Question 380152
Distance = 420 miles
..
speed of 1 car = x
speed of other car = x-30
...
time they meet = 3.5 hours
...
since they are travelling towards each other add up the speeds
x+x-30= 2x-30
..
t= d/r
3.5=420/(2x-30)
multiply by (2x-30)
3.5(2x-30)=420
7x-105=420
+105
7x=420+105
7x=525
/7
x=75 mph ....speed of one car
speed of other car = 75 -30 = 45 mph
...
m.ananth@hotmail.ca