Question

To travel 648 km, an express train takes 12 hours more than rajdhani. If however, the speed of the express train is doubled, it takes 6 hours less than rajdhani. The speed of rajdhani is

Answer 1

Answer:

According to the problem the distance is 648 Km.

Let the speed of rajdhani is u km/h

and the sped of express train v km/h

As mentioned express train takes 12 hours extra than rajdhani

therefore,

648/v - 648/u = 12......(i)

Now if the express train doubles its speed it will be 6 hours faster than rajdhani

therefore,

648/u - 648/2v = 6......(ii)

by solving both the equation we will have the speed of rajdhani