SOLUTION: two cars leave delhi at the same time travelling in opposite directions. if the average speed of one car is 5 km/hr more than that of the other and they are 425 km apart at the end

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: two cars leave delhi at the same time travelling in opposite directions. if the average speed of one car is 5 km/hr more than that of the other and they are 425 km apart at the end      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 547081: two cars leave delhi at the same time travelling in opposite directions. if the average speed of one car is 5 km/hr more than that of the other and they are 425 km apart at the end of 5 hrs, what is the average speed of each?
Found 2 solutions by josmiceli, mananth:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
You can add their speeds to get the speed
at which they are moving apart
Let that speed = +s+%2B+s+%2B+5+
+425+=+%28+2s+%2B+5+%29%2A5+
+425+=+10s+%2B+25+
+10s+=+400+
+s+=+40+
+s+%2B+5+=+45+
Their average speeds are 40 km/hr and 45 km/hr

Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Car I x kmph
Car II x+ 5 kmph
..
They are moving away from each other

So add up their speed.

combined speed = x+x+5
(2x+5)
Time = 5 hours
Distance = 425 km
Distance = speed * time
(2x+5 )* 5 = 425
10 x + 25 = 425
10 x = 425 + -25
10 x = 400
/ 10
x= 40 kmph Car I
Car II 40 + 5 = 45 kmph
m.ananth@hotmail.ca