 
<translate> Na farko sami lokacin tafiya na yanzu 600 mil / 50 mil a kowace awa = 12 hours. 12 hours - 4 hours = 8 hours da ake so tafiya lokaci. 600 mil / 8 hours = 75 mil a kowace awa. 75 mil sa'a - 50 mil sa'a = 25 mil sa'a sauri. Amsar ita ce: 25. <eng> 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. 