 
 <translate> First find his current travel time 600 miles / 50 miles per hour = 12 hours. 12 hours - 4 hours = 8 hours desired travel time. 600 miles / 8 hours = 75 miles per hour. 75 miles per hour - 50 miles per hour = 25 miles per hour faster.
The answer: 25. <ibo> Buru ụzọ chọpụta oge ọ na-eme njem ugbu a na 600 kilomita / 50 kilomita kwa elekere = 12 awa. 12 awa - 4 awa = 8 awa chọrọ njem oge. 600 kilomita / 8 awa = 75 kilomita kwa elekere. 75 kilomita kwa elekere - 50 kilomita kwa elekere = 25 kilomita kwa elekere ngwa ngwa. Azịza ya bụ: 25. 