SOLUTION: a train travels a certain distance taking 7 hrs in forward journey, during return yourney increased speed of 12km/hr take the time 5 hrs. What is the distance traveled?

Question 345948: a train travels a certain distance taking 7 hrs in forward journey, during return yourney increased speed of 12km/hr take the time 5 hrs. What is the distance traveled?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
both ways the distance traveled is the same.
time * speed forward = time * speed on return
let speed while going be x mph. time = 7 hours
return speed = x+12. time = 5 hours
7x=(x+12)*5
7x=5x+60
7x-5x=60
2x=60
x=30 mph speed forward
time = 7 hours
..
distance = 7*30 = 210 miles
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