SOLUTION: Dino traveled for 1 1/2 h at 80 km/h for the first 2/5 of his journey. His average speed for the whole journey was 75 km/h. How long did he take to complete the remaining part of h

Question 856345: Dino traveled for 1 1/2 h at 80 km/h for the first 2/5 of his journey. His average speed for the whole journey was 75 km/h. How long did he take to complete the remaining part of his journey?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Dino traveled for 1 1/2 h at 80 km/h for the first 2/5 of his journey. His average speed for the whole journey was 75 km/h. How long did he take to complete the remaining part of his journey?
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distance traveled for 2/5 of the journey=1.5*80=120 km
distance traveled for remaining 3/5 of journey=3/2*120=180
Total distance of journey=120+180=300 km
travel time for entire journey=300/75=4 hrs
time to complete the remaining part of his journey=4-1.5=2.5 hrs
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