Posted by Fatima on .
A motorist do does the first part of his journey at an average speed of 54km/h. Then he increases the speed to 60km/h for the rest of the journey. If he travels 225km in 4 hours, what is the distance traveled for the rest of his journey? show clear steps.

Mathematics 
drwls,
54 T1 + 60 T2 = 225 (km)
T1 + T2 = 4 (hours)
54 T1 + 54 T2 = 216
6 T2 = 9
T2 = 1.5 hours
T1 = 2.5 hours
60 T2 = 90 km is travelled at the higher speed.