a train covers a distance of 300km at a constant speed .if the speed of the train is increased by 5km/hr the journey would have taken 2 hour less.find the original speed of train?
a train covers a distance of 300km at a constant speed .if the speed of the train is increased by 5km/hr the journey would have taken 2 hour less.find the original speed of train?
If the original speed is , then the time to travel is:
,
similarly at the higher speed it would take:
.
But we are told , so:
which we can rearrange to:
Which has two solutions and you need the poitive one.