## Answer :

*Let the distance be x km*

*Time taken to travel x with speed 25kmph= x/25h*

*Time taken to travel x distance with 30kmph=x/30 h*

*As per question x/25=x/30 +180/60*

*⇒ x/25=x/30 + 3*

*⇒ (6x-5x)150=3*

*⇒ x= 450km*

*Distance is 450km*and timetaken = y

speed=x1/y1=25km/hr

here x1=25y1

speed=30km/hr

here x2=30y2

y1-y2=3hr

therefore

450