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A car covers first 10 km with 40km/hr next 10km with 60 km and next 10 km in 20 km/hr. What is the average speed of the car?
Updated: 3/9/2023
#1; 10 km @ 40 kmph = 0.25 hrs 15 mins)
#2; 10 km @ 60 kmph = 0.166666..... hrs 10 min
#3; 10 km @ 20 kmph = 0.5 hrs 30 mins.
Distance = 30 km
Time = 0.25 + 0.16666... + 0.5 = 0.9166666... hrs
Hence average speed is 30 km / 0.916666... = 32.7272... kmph
7272
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