If Rahim walks at 14 km/hr instead of 10 km/hr for a certain time, he would have walked 20 km more. If Rahim walks at a speed...

If Rahim walks at 14 km/hr instead of 10 km/hr for a certain time, he would have walked 20 km more. If Rahim walks at a speed of 10 km/hr, the distance travelled by him within that time is -