SOLUTION: Over a distance of 120 km, the average speed of a train is 40km/h faster than that of a car. If the train covers the distance in 30min less time, find its average speed.
an equa
Algebra.Com
Question 106504: Over a distance of 120 km, the average speed of a train is 40km/h faster than that of a car. If the train covers the distance in 30min less time, find its average speed.
an equation for this pls?
thanks =D
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
let x="speed of train"
from car ... t=d/r ... t=120/(x-40)
from train ... r=d/t ... x=120/((120/(x-40))-30)
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