Raj drives faster by 10 km/h. he reaches his village 90 minutes early. If he drives slower by 10 km h, he reaches the
llage 150 minutes late. Find the distance he travels.

let with speed X km/hr he can travel distance D km in T hr time
So, D = X.T......(1)

Putting 1st condition: D = (X+10) .(T-1.5)
......(2)
Putting 2nd condition: D = (X-10).(T+2.5) ........(3)

Equating (1) & (2), we get
2.5X-10T=25..........(4)

Similarly, (1) & (3) gives us
-1.5X+10T=15.........(5)

Add (4) & (5), we get
X=40 km/hr

Pit this in (4), we get T=7.5 hr

Put these values in (1), we get D=300 km