Question

A train covered a distance at a uniform speed. If the train had been 30 km/hr faster, it would

have taken 2 hours less than the scheduled time. If the train was slower by 15 km/hr, it would have taken 2

hours more than the scheduled time. Find the distance ?​

Answer 1

Answer:

Let the speed of the train be xkm/h and the time taken by train to travel the given distance be t hours and the distance to travel be dkm. We know that,

⇒Speed=TimeDistance

⇒x=td

∴d=xt.......(i)

Case 1

⇒(x+10)×(t−2)=d

⇒xt+10t−2x−20=d

⇒d+10t−2x−20=d

⇒−2x+10t=20...... (ii)

Case 2

⇒(x−10)×(t+3)=d

⇒xt−10t+3x−30=d

⇒d−10t+3x−30=d

⇒3x−10t=30......... (iii)

Adding equations (ii) and (iii), we gets 

⇒x=50

Substitute the value of x in (ii) we gets

⇒(−2)×(50)+10t=20

⇒−100+10t=20

⇒10t=120

⇒t=12 hours

Substitue the value of t  and x in  equation (i), we gets

Distance to travel =d=xt

⇒d=12×50=