Mr. G. travel by car from one city to another. He drives 30.0 minutes at 80.0 km/h, 12.0 minutes at 105 km.h and 45.0 minutes at
40.0 km/h. He also spends 15.0 minutes eating lunch at a rest stop. What is the average speed for the entire trip?
1 answer:
Answer:
53.5 km/h
Step-by-step explanation:
Average speed = distance /time
Total time in hours = 30/60 + 12/60 + 45/60 + 15/60
= 0.5 + 0.2 + 0.75 + 0.25
= 1.7 hours
Distance = Speed / time
Total distance covered = (0.5*80) + (0.2*105) + (0.75*40)
= 40 + 21 + 30
= 91 km
Average speed of the entire trip = 91/1.7
= 53.5 km/ h
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