The time taken by a person to cover 150 km was 2.5 hrs more than the time taken in the return journey. If he returned at a speed of 10km/hr more than the speed of going, what was the speed per hour in each direction?
going speed =−30km/hr, returning=−20km/hr
going speed =20km/hr, returning=30km/hr
going speed =30km/hr, returning=40km/hr
going speed =30km/hr, returning=20km/hr